Looking for info on the Posner and connected families...

Rosa Posner (possibly daughter of Louis) married Michael Cassel NYC 1870. Moved to Denver

Moritz (Morris) Posner married Ricka (Rishka) Lelewer
and lived in Indianapolis late 1800's.

Nathan and Bertha Posner. (Rosa's aunt and uncle?) from Posen... came to NYC?

Ray Posner (female) NYC

Dora Posner Horwitz wife of Morris Horwitz (Daughter of Moritz Posner)

Myrtle Leah Posner NYC

Aunt Lotta Rosenthal NYC

Celia Rosenthal Galland wife of Dave Galland NYC

Mary Rosenthal Abrahams wife of Doctor Robert Abrahams NYC.....
Chester and Walter Abrahams (their Children)

Most of what I have is pieced together from pictures, I don't know the relationship between Rosa Posner and the other Posners. Also I don't know how the Rosenthal family (and subsequent lines of Abrahams and Galland) is related to the posners. Any help would be greatly appreciated. Thanks