Constantine "Costas" George Sioras, of Belmont, Massachuetts passed away peacefully on January 25, 2026 surrounded by his loving family.
He was born in Dyrachion, Arcadias, Greece to the late George and Vasiliki (Kefalas) Sioras.

He is survived by his beloved wife Katherine (Saras) Sioras. Devoted father of Valerie Sioras, Joanne Urso and her husband Frank, and Georgia Dakoyannis and her husband Louis.  Father in law of Dennis Razis. Loving Pappou of Teodoro Silva, Michael Razis, John Dakoyannis, Katherine Silva, Constantine Razis and Joanna Dakoyannis.  Loving brother of Eric Sioras and his wife Elaine and the late Demetra Stathopoulos and the late Amalia Berdenis. Brother in law of Nikitas Stathopoulos, Stefanos Berdenis, and Anna Povinelli and her husband Thomas.

Also survived by many nieces, nephews, relatives and friends here and in Greece

Funeral Services will take place on Thursday, January 29, 2026 at 11AM at Sts. Constantine and Helen Greek Orthodox Church,
14 Magazine Street, Cambridge, MA.  Visitation will be held from 9:30AM to 11:00AM at the church. Relatives and friends are kindly invited to attend. In lieu of flowers, donations in Costa's memory may be made to the above named church.

Burial at Mt. Auburn Cemetery, Cambridge, Masssachusetts.