Olympia was born in Kios (Gemlex) Turkey, to Paul and Aglaia Delifoty Mavrides. Peter and Olympia were married on October 16, 1921. Olympia and Peter are survived by two sons, Chris Demiris of Salt Lake City; and George Demiris of Santa Rosa, California; and a daughter, Helen D. Winders of Whittier, California
Chris married Tina Demiris in 1957, and they had two children, Marina and Chris Jr.