Martin Joseph Whalen (Jr.) is the son of Mary Suzanne McGrath and Martin Joseph Whalen (Sr.). He was born in 1960 in Illinois.

In 1994, he married Kathleen Ann Kennedy in Illinois. She is the daughter of James Kennedy and Betsy Finneran. She was born in 1964 in Illinois.

Children of Martin Joseph Whalen (Jr.) and Kathleen Ann Kennedy:

1. William Kennedy Whalen was born in 1995 in Illinois.
2. Rowan Kennedy Whalen was born in 1997 in Illinois.
3. Fiona Kennedy Whalen was born in 1998 in Illinois.
4. Martin Joseph Whalen (III) was born in 2000.