William M. Wanamaker is the son of Miriam Lavonia Sites and Ferdinand Peter Wanamaker. He was born 10 January 1926 in Ottawa, Putnam, Ohio.

In 1952, he married Mary Agnes Scherpenberg in Ohio. She was born in 1926 in Ohio.

Children of William M. Wanamaker and Mary Agnes Scherpenberg:

1. Terri Wanamaker
2. Margaret Wanamaker
3. William Wanamaker
4. Robert Wanamaker