Gavin Blaine Foster is the son of Coretta Mae Sullivan and Donald Lee Foster. He was born in 1970 in Japan.

In 1991, he married Annjeanette Ray Roy in Washington state. She is the daughter of Elmer Patrick Roy and Crystal Lea Miller. She was born in 1970 in Washington state.

Children of Gavin Blaine Foster and Annjeanette Ray Roy:

1. Kaitlyn Nicole Foster was born in 1993 in Washington state.
2. Brandy Lee Foster was born in 1994 in Washington state.
3. Peyton Suzanne Foster was born in 2000 in Washington state.