Rex Wallace Harkness is the son of Ruth Shirley Reid and Clarence William Harkness. He was born in 1951 in Montana.

• In 1972, at age 21, he married Carol Mae Ferngren, who was also age 21, in Washington state. She is the daughter of Al Fergren and Wilma. She was born in 1951 in Washington state.

Children of Rex Wallace Harkness and Carol Mae Ferngren:

1. Jared Harkness was born in 1981.
   • In 2009, at age 28, he married Jenny Giesen in Washington state.
2. Kristen Harkness was born in 1983.
3. Melissa Harkness was born in 1988.