Your grandmother, Evelyn, was actually the oldest daughter of Ramon and Jennie, not the youngest. And Evelyn was quite adored by her father (as well as an outstanding pianist! ) Ramon left her a brownstone in Greenwich Village when he passed away. My grandfather, Henry, was your grandmother's brother. He named one of his children Evelyn after your grandmother.
(and Ramon did have two women. Besides the evidence in research, I spoke to several family members who knew this! Astonishing really!)