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(Credit: Photo by Ed Betz)

NESCONSET, NY, APRIL 4, 2010: Steve Trebing with daughter, Katie, 7, center, and son Calvin, 10, left, wife Stacy, and son Christopher, 4, right, whose bone marrow saved his sister, at their home in Nesconset, NY, April 4, 2010. Photo by Ed Betz

Katie Trebing photos

Katie Trebing photos

NESCONSET, NY, APRIL 4, 2010: Steve Trebing with
(Credit: Photo by Ed Betz)

NESCONSET, NY, APRIL 4, 2010: Steve Trebing with daughter, Katie, 7, center, and son Calvin, 10, left, wife Stacy, and son Christopher, 4, right, whose bone marrow saved his sister, at their home in Nesconset, NY, April 4, 2010. Photo by Ed Betz

NESCONSET, NY, APRIL 4, 2010: Steve Trebing with
(Credit: Photo by Ed Betz)

NESCONSET, NY, APRIL 4, 2010: Steve Trebing with daughter Katie, 7, center and son Calvin, 10, left, and Christopher, 4, right, whose bone marrow saved his sister, at their home in Nesconset, NY, April 4, 2010.

NESCONSET, NY, APRIL 4, 2010: Steve Trebing with
(Credit: Photo by Ed Betz)

NESCONSET, NY, APRIL 4, 2010: Steve Trebing with daughter Katie, 7, and wife Stacy, at their home in Nesconset, NY, April 4, 2010. Photo by Ed Betz

NESCONSET, NY, APRIL 4, 2010: Stacy Trebing with
(Credit: Photo by Ed Betz)

NESCONSET, NY, APRIL 4, 2010: Stacy Trebing with daughter Katie, 7, at their home in Nesconset, NY, April 4, 2010.

NESCONSET, NY, APRIL 4, 2010: Steve Trebing with
(Credit: Photo by Ed Betz)

NESCONSET, NY, APRIL 4, 2010: Steve Trebing with daughter Katie, 7, left, and sons Calvin, 10, right, and Christopher, 4, center, whose bone marrow saved his sister, at their home in Nesconset, NY, April 4, 2010.

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NESCONSET, NY, APRIL 4, 2010: Steve Trebing with
(Credit: Photo by Ed Betz)

NESCONSET, NY, APRIL 4, 2010: Steve Trebing with daughter Katie, 7, center, and son Calvin, 10, left, wife Stacy, and Christopher, 4, striped shirt, whose bone marrow saved his sister, at their home in Nesconset, NY, April 4, 2010. Photo by Ed Betz

NESCONSET, NY, APRIL 4, 2010: Steve Trebing with
(Credit: Photo by Ed Betz)

NESCONSET, NY, APRIL 4, 2010: Steve Trebing with daughter Katie, 7, center, and son Calvin, 10, left, wife Stacy, and Christopher, 4, striped shirt, whose bone marrow saved his sister, at their home in Nesconset, NY, April 4, 2010. Photo by Ed Betz

Katie Trebing, 7, sits with her mom at
(Credit: Ed Betz)

Katie Trebing, 7, sits with her mom at home in Nesconset. (April 4, 2010)

Katie Trebing, center, takes a creative movement class
(Credit: Newsday / Bill Davis)

Katie Trebing, center, takes a creative movement class with instructor Laura Beth Moon, who is teaching ballet and tap, at LoPresti Dance Theatre in Nesconset. (April 19, 2007)

After Katie Trebing's creative movement class, she and
(Credit: Newsday / Bill Davis)

After Katie Trebing's creative movement class, she and her brother Christopher, almost 2, share ices at Ralph's Famous Italian Ices. (April 19, 2007)

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An exhausted Katie Trebing rests on her mother's
(Credit: Newsday / Beth Whitehouse)

An exhausted Katie Trebing rests on her mother's lap during the annual Bone Marrow Foundation fundraiser in Manhattan in May 2007.

Katie Trebing is seen in a family photo

Katie Trebing is seen in a family photo during her Make-A-Wish trip to Walt Disney World in 2007.

The Trebings play in Gibbs Pond Park in
(Credit: Newsday / Bill Davis )

The Trebings play in Gibbs Pond Park in Nesconset. Katie Trebing, 4, foreground, swings. (Sept. 14, 2007)

The Trebings at play in Gibbs Pond Park
(Credit: Newsday / Bill Davis)

The Trebings at play in Gibbs Pond Park in Nesconset. Stacy Trebing gives her son, Christopher, 2, a push on the swing. (Sept. 14, 2007)

Steve and Christopher Trebing, right, share a moment
(Credit: Newsday / Bill Davis)

Steve and Christopher Trebing, right, share a moment as Hobbs looks on. The Trebing family spent the day on Fire Island with Steve's parents, Rich and Kathy Trebing, who have a house there. (Aug. 16, 2007)

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Steve and Stacy Trebing talk with ABC News
(Credit: Trebing family handout)

Steve and Stacy Trebing talk with ABC News correspondent, Elizabeth Vargas at their Nesconset home. Their story will air on '20/20.'

Katie Trebing eats cupcakes with her brother, Christopher,
(Credit: Newsday / Michael E. Ach)

Katie Trebing eats cupcakes with her brother, Christopher, at her fifth birthday party.

Katie, her mom Stacy, and brother Christopher Trebing.
(Credit: Newsday / Michael E. Ach)

Katie, her mom Stacy, and brother Christopher Trebing.

Katie, her mom Stacy, and brother Christopher Trebing.
(Credit: Newsday / Michael E. Ach)

Katie, her mom Stacy, and brother Christopher Trebing.

Katie Trebing and her brother Christopher, who was
(Credit: Newsday / Michael E. Ach)

Katie Trebing and her brother Christopher, who was a bone marrow donor for his sister, play in the playground.

Christopher and Katie Trebing eat cupcakes during a
(Credit: Newsday / Michael E. Ach)

Christopher and Katie Trebing eat cupcakes during a fifth birthday party.

Katie Trebing reads a book to her class
(Credit: Newsday / Michael E. Ach)

Katie Trebing reads a book to her class as she sits on her mother Stacy's lap.

Katie Trebing reads a book to her class
(Credit: Newsday / Michael E. Ach)

Katie Trebing reads a book to her class as she sits on her mother Stacy's lap during her fifth birthday party.