Didymos was born on October 29, 1920, the son of Ittyavira Thomas of Chiramel-Mulamootil House in Nedumbram near Thiruvalla and Sosamma of Chiramel House in Mavelikara. He joined the Tabor Dayara in Pathanapuram in 1939 where he completed his high school education. He passed his Intermediate from C.M.S College, Kottayam in 1945, his B.A from National College, Tiruchirapalli in 1951, his B.T from Maston Training College, Chennai in 1954, and his M.A from Christ Church College, Kanpur in 1961.