Grace being brought to Hawaii is the sole reason Danny quit his job as a police officer in New Jersey and came to the island state, joining the Honolulu Police Department and eventually Five-0 Task Force.
Whenever Grace is not with Rachel and Stan, she usually stays with Danny on weekends. Every Christmas, Danny dresses up as Santa Claus to surprise her.
Thanks to her father teaching her, Grace is also skilled at poker.
Danny has one of her drawings and a toy police car in his office, as well as a picture of her when she was younger. She also drew him a picture when he was hospitalized for sarin gas poisoning. Sometimes, Grace uses her phone to call her father at night.
Being her father, Danny takes Grace's safety and well-being very seriously, often reacting in a violent and frightening manner if he feels that Grace's life has been jeopardized which is seen during "E Malama, Mai Ka Wa Kahiko", and "Hana Komo Pae".
Grace was born in New Jersey to Danny Williams and Rachel Hollander. She was named after her father's deceased ex-partner, Detective Grace Tillwell. Sometime after her parents divorced, she moved to Hawaii with her mother.
Grace is first seen in the pilot when Danny drives her to school.
In "Malama Ka Aina", Grace attends a Kukui High School football game with Danno, where she meets Steve, Kono, and Chin for the first time. However, a gang related shooting cuts her visit short and causes Rachel to feel concerned for her safety around Danny.
In "Mai Ka Wa Kahiko", Grace is kidnapped by Danny's ex-partner, Rick Peterson, who spent ten years in prison due to Danny's testimony against him in court. This forces Danny to go off the grid to save Grace's life, and he even shows his darker side, which is demonstrated when he shoots Peterson in the kneecap to force him to reveal Grace's location. Despite this, Peterson refuses, and Danny threatens to shoot Peterson in the head, eventually forcing Peterson to give in.
In the finale, her mother and stepfather are planning to move to Las Vegas for Stan's job. Danny eventually calls Rachel and tells her that he'll see her in court.
In "Huaka'I Kula", an Aloha Girls camping trip with Grace turns deadly when an armed man locks Grace, Danny, along with the rest of the team in a bunker while he takes Steve and a girl hostage. They managed to free themselves after they manage to loosen some floorboard with Grace helping to dig herself out of the bunker and freed the rest of the group.
Danny recently won the right to keep Grace with him in Hawaii, instead of moving to Nevada to live with her stepfather.
In Na Hala a ka makua, Grace gets suspended from school for a week since she punched a student for bullying.
This section is empty. You can help Hawaii Five-O Wiki by editing it.
This section is empty. You can help Hawaii Five-O Wiki by editing it.
In 7.08, 'Hana Komo Pae' ('Right of Passage'), Grace goes to a winter formal that is being chaperoned by Danny. It is revealed by Will Grover that he is her boyfriend. When Danny takes Will into the bathroom to talk to him about Grace, a splinter group of Al-Qaeda terrorists takes the dancers hostage. They are looking for a specific kid named Jeremy. It is up to Danny and Will to get a message to the outside to save everyone inside and also to protect Grace. The plan goes awry when the hostage-takers discover that Danny is missing and threaten to kill Grace if he does not come to the room and deliver Jeremy. When he does, they are all taken hostage and now it is up to Will and Five-0 to save everyone. One hostage-taker talks to Steve and tells him that if they do not get Jeremy's father on the phone to give them what they want, Danny and Grace will be the first ones to die. One of the people who is keeping them hostage has Danny call Steve. Danny keeps referring to Will when he is on the phone with Steve and Will is Lou's son but Steve and Kono don't get it. Then Lou comes over and realizes that Danny means his son Will is in a safe place and he is supposed to call him. Lou calls Will and asks if he is alright and then Will says that he can get a better view of the ballroom where the hostages are. Will then goes down and starts a live stream for Chin, Lou, Steve and Kono to see how many enemies are inside the ballroom using his smartphone. They eventually infiltrate the room with the hostages and everyone is saved unharmed. Steve looks first for Grace as he is very concerned about her, as he sees her like a daughter.
This section is empty. You can help Hawaii Five-O Wiki by adding to it.
In "A Bruise Inflicted on an Innocent Person Vanishes Quickly", Grace ends up in a car accident along with a friend and they all assume that she was responsible, but was proven otherwise and was welcomed home by the Five-0 team. In "Those Above are Descending", while still recovering, Grace convinces a visiting Steve to get her father to stop spoiling her.
Grace appears to have lots of friends at her school. Danny tries to balance out her privileged upbringing with her mother and stepfather. Grace refers to her father's partner and a former Navy SEAL, Lieutenant Commander Steve McGarrett as "Uncle Steve". Grace, like Steve, calls her father "Danno." She has done so since she was a small child, which, upon hearing Danny tell the story, is where McGarrett got the idea to call him that as well.
Grace is somewhat shy/wary around new people, with the exception of her father's teammates, of whom it is implied he speaks of often.
As a kid, Grace likes pink, Hello Kitty (dolls, laptop), sports (baseball, tennis, football, and cheerleading) and animals. She has two pets, a rabbit (Mr. Hoppy) and an unnamed male dog previously belonging to Agent Monica Jennsen.
As a teenager, she starts behave like others teenagers as she lied to Danny when she was going to her friend's Halloween party, and her boyfriend is now Will, much to the dismay of both Danny and Grover. Despite this, Grace still loved her family. She is also shown very close to her younger brother Charlie, whom she is very protective of.
|Pilot||Ohana||Malama Ka Aina||Lanakila||Nalowale||Ko'olauloa||Ho'apono||Mana'o||Po'ipu||Heihei||Palekaiko||Hana 'a'a Makehewa|
|Ke Kinohi||He Kane Hewa'ole||Kai e'e||E Malama||Powa Maka Moana||Loa Aloha||Ne Me'e Laua Na Paio||Ma Ke Kahakai||Ho'opa'i||Ho'ohuli Na'au||Ua Hiki Mai Kapalena Pau||Oia'i'o|
|Ha'i'ole||Ua Lawe Wale||Kame'e||Mea Makamae||Ma'eme'e||Ka Hakaka Maika'i||Ka Iwi Kapu||Lapa'au||Ike Maka||Kil'ilua||Pahele||Alaheo Pau'ole|
|Ka Ho' Oponopono||Pu'olo||Mai Ka Wa Kahiko||I Helu Pu||Kupale||Lekio||Kalele||Ha'alele||Pa Make Loa||Ua Hopu||Ua Hala|
|La O Na Makuahine||Kanalua||Lana I Ka Moana||Popilikia||Mohai||I Ka Wa Mamua||Ohuna||Wahine'inoloa||Ha'awe Make Loa||Huaka'I Kula||Kahu||Kapu|
|Olelo Ho'Opa'I Make||Hana I Wa 'Ia||Hookman||Kekoa||Pa'ani||Na Ki'i||Hoa Pili||Olelo Pa'a||Imi Loko Ka 'Uhanet||Ho'opio||He Welo 'oihana||Aloha, Malama Pono|
|Aloha ke kahi I ke kahi||A'ale Ma'a Wau||Ka 'oia'i'o ma loko||A ia la aku||Kupu'eu||Kupouli 'la||Ua Nalohia||Akanahe||Ha'uoli La Ho'omoaika'i||Ho'onani Makuakane||Pukana|
|O kela me keia manawa||Hana Lokomaika'i||Na Hala a ka makua||Pale'la||Hoku Welowelo||Ma lalo o ka ili||Ho'i Hou||Ku I Ka Pili Koko||Pe'epe'e Kanaka||Makani 'Olu a Holo Malie||O ka Pili'Ohana ka 'Oit|
|A'ohe kahi e pe'e ai||Ka Makuakan||Kanalu Hope Loa||Ka Noe'au||Ho'oilina||Ho'oma'ike||Ina Paha||Ka Hana Malu||Ke Koho Mamao Ak||Wawahi moe'uhane||Ua'aihue||Poina 'Ole||La Po'ino|
|Powehiwehi||E 'Imi pono||Nanahu||Kuka'awale||Pono Kaulike||Kahania||Ike Hanau||Ua helele'i ka hoku||Ho'amoano||Mo'o 'olelo Pu||Luapo'i||A Make Kāua|
|Mai ho`oni i ka wai lana mâlie||Lehu a Lehu||Ua 'o'oloku ke anu i na mauna||Ka Papahana Holo Pono||Ka 'alapahi nui||Na Pilikua Nui||Na Kama Hele||Piko Pau 'iole||Hana Keaka||Ka Makau kaa kaua||Kulean||Ua Ola Loko I Ke Aloha||Umia Ka Hanu|
|Hoa 'Inea||Ke Koa Lokomaika'i||Ka Pohaku Kihi Pa'a||Waiwai||Kanaka Hahai||Malama Ka Po'e||Ka Haunaele||Ka Pono Ku'oko'a||I'ike Ke Ao||Pilina Koko||Pa'a Ka 'Ipuka I Ka 'Upena Nananana||O Ke Ali'I Wale No Ka'u Makemake|
|Makaukau 'ce e Pa'ani||No Ke Ali'i' Wahine A Me Ka Aina||He Moho Hou||Hu a'e ke ahi lanakila a Kamaile||Ke Ku 'Ana||Ka hale ho'okauweli||Ka makuahine a me ke keikikane||Hana Komo Pae||Elua la ma Nowemapa||Ka Luhi||Ka’ili aku||Ka 'Aelike||Ua ho'i ka 'ōpua I Awalua|
|Ka laina ma ke one||Ka Pa'ani Nui||Poniu I Ke Aloha||Hahai i nā pilikua nui||E mālama pono||Puka 'ana||Huikau nā makau a nā lawai'a||Ua malo'o ka wai||Waimaka 'ele'ele||Wehe 'ana||He ke’u na ka ‘alae a Hina||Ua mau ke ea o ka 'aina i ka pono|
|Fire Will Never Say that It Has Had Enough||Dog Days||Your Knife, My Back. My Gun, Your Head||No Matter How Much One Covers a Steaming Imu, The Smoke Will Rise||At Kama'oma'o, The Land of Activities||Unfolded by the Water are the Faces of the Flowers||The Royal Eyes Rest Above||The Trail Leads To A Diving Place; Do Not Follow After||Death at Sea||The Future is in the Past||A Tall Tree Stands Above the Others||The Round Up||What is Gone is Gone|
|The Children of Kalaihaohia||A Coral Reef Strengthens Out into Land||Only the Stars of Heaven Know Where Pae Is||The Fire Blazed Up, Then Only Ashes Were Left||To Do One's Duty||No One Has Ever Died For the Mistakes He Has Made; Only Because He Didn't Repent||Kind Is the Bird of Kaiona||The Answer to the Riddle is Seen||Though the Fish is Well Salted, the Maggots Crawl||What Parents Will Do, Children Will Do||The Tough Branch That Does Not Break in the Kona Gale||Ancients Exposed|
|Cocoon||The Man Who Fell from the Sky||When the Sea Draws Out the Tidal Wave, the Rocks Where the Cowries Hide Are Exposed||On the Slope of the Cliff, Not One Jutting Rock is Hidden from Sight||Nothing More the Eyes to Search For||Is Borne on the Back; Is Borne in the Arms||The Smoke Seen in the Dream Now Rises||Birds of a Feather...||Truth Comes from the Night||When the Light Goes Out, the House Is Dark||Gone on the Road from which There Is No Returning||A Bruise Inflicted on an Innocent Person Vanishes Quickly||Those Above are Descending|
|Depressed with the Heat of Kealwalua||Made Prisoner by the Reign of the Rain||When Covetousness is Conceived, Sin is Born||Offer Young Yaro Leaves to||He Who Eats 'Ape is Bound to Have His Mouth Itch||The Octopus of the Deep Spews It's Ink||Way of the Gun||Offspring of an Owl||The Teacher, the Pupil - Let it Come Forth||A Stranger Only for a Day||The Hand is at Fault||Endlessly Pours the Rain of Waianae|
|Hawaii Five-0 Characters|
|Final||Steve McGarrett • Danny Williams • Adam Noshimuri • Tani Rey • Junior Reigns • Lou Grover • Kamekona Tupuola • Duke Lukela • Noelani Cunha • Quinn Liu|
|Former||Chin Ho Kelly • Kono Kalakaua • Max Bergman • Catherine Rollins • Jerry Ortega|
|Other||Lori Weston • Mary McGarrett • Grace Williams • Charles Williams • Jenna Kaye • Dr. Malia Waincroft|