I've just started searching. My father was Edward F, my grandfather was Andrew J. his father was Daniel L. and his father was David who was married to Jane C. The 1880 census in Trenton Mercer New Jersey 1st District 2nd Ward listed him as a plumber, father and mother born in Ireland. Their children are:
Martha J. Daniel L. Walter E. George
I'm unsure if this David is the David listed in the 1850 census as the son of Thomas and Matilda. Any additional information you can provide would be greatly appreciated. I still live in Mercer County, NJ.