Spouse: Zelda (Jean) Friedman (Married)
Children: Cyril Jacob Kaplan, Colin Prof. Kaplan, Carmel Malke Kaplan
Saul's Heritage
Parents: Boruch Kaplan, Chana Pesa (Annie) Gittelman
Siblings: Jack Kaplan, Aaron Kaplan, Maximillian William Kaplan, Aubrey Kaplan, Maurice Kaplan