I'm trying to find the record of my father's divorce to his first wife - he died in '83. Don't have ex-wife's name, but I was told condition of divorce was that he give up parental rights to child she was pregnant with at time of the divorce. So I am trying to find our sister (I have 3 sibs). I know he was a professor @ Princeton University at that time, but not sure if he lived in PA or NJ. I'm guessing the marriage & divorce took place sometime between 1940-1958 (he married my mom in 1959). No idea where to start....