Ioannis Coumantaros

Ioannis ran the ships, along with his nephew Stavros Niarchos, the son of his sister,^[1] Eugenie Koumantaros, who had married Spyros Niarchos.

He married Flora Nomikos, the daughter of Peter Nomikos, from a "traditional maritime family".^[1]

They had two children, a son, George S. Coumantaros, who married, Sophie Yannagas, the daughter of George Yannagas from Kasos, and they had two sons, Yannis and John, and three daughters, Flora, Elena and Eugenie.^[1] Their daughter Aikaterini "Dolly" I. Coumantaros married Nicholas P. "Nikos" Goulandris from Andros.^[1] They founded the Goulandris Museum of Cycladic Art in Athens.^[2][3]