Who is Hagop Chilinguirian from Black Dog of Fate: A Memoir and what is their importance?

Hagop Chilinguirian is the first husband of Nafina, Peter's maternal grandmother. Nothing much is said of Hagop, other than he died during the deportation, leaving young Nafina and their two children to carry on without him. While his character is small, the ramifications of his death, leaving a young mother and two young daughters to survive during a genocide, is massive.