The only thing I had to start with was their headstones with dates. Through that I found death certificates and parents names (discovered names of great great granparents). They were buried in a plot by the name of Levy and, by chance, requested the death certificate of one of them since she died so young (39, puerperal sepsis). Turns out the name of her father was my great grandfather, so, I stumbled on this by accident. Turns out, I discovered his daughter. Then found HER on the census. BUT....the mother's name doesn't match my GGM's name, so, either my GGF had an earlier wife who died and he remarried, or, typical for back then, typographical error, or, my GGM's name was a nickname for her real name.
I've got me work cut out for me.