Mrs Marcus the paternal grandmather

This is my paternal grandmother, Marcus [unknown first name], around 1930, in Bucharest. I don't know anything about my paternal grandparents, the Marcus family. I don't know my grandmother's maiden name. I once saw her at an old age home of the [Bucharest Jewish] community. My father, Carol Marcus, was [probably] born in 1900. He didn't have any education. He was an entrepreneur who made his own workshop of brushes and paintbrushes, although he had no qualification in this trade. He quit both his workshop and my mother who was pregnant and set off to join the Russian revolution. I don't recall ever meeting him. He only saw me once. He died in April 1921 and my mother remarried. I didn't have any relationships with my father's family for a long time. I don't know the name of my father's elder sister, who raised him. [His brothers,] Simon and Marcu [Marcus] emigrated to Israel. His sister emigrated to America [before 1921], got married, and acquired the name Monbllat. She went mad when she found out that my father had been killed. She had two girls and two boys.