Sort of Incest?

I was digging around in my attic a few months ago and found a box of old pictures from the 30's. I saw a picture of this girl in a bathing suit that was so hot. I turned the picture around and saw that it was my great grand mother when she was around my age (I'm, 19). She died 6 years before I was born and would be well into her 100's if she was alive now.

I mean, I never met the woman, and wft was I doing back before anyone ever heard of Adolf Hitler.

Note: Her father was a powerful mobster that was assassinated by a rival mob in the 20's.