My gggrandfather, Robert Dunlap, is a major brick wall. I do not know what part of Ireland he came from, do not know his birth date or exactly when he arrived in U.S. I do know that my great grandmother, Elizabeth was born in Pa. in 1826 and that Robert died in Pa. in 1841. According to the 1900 census my great grandmother stated that her father was born in Ireland and her mother in Pa. There was a Robert Dunlap who arrived in Philadelphia from Ireland in 1803 but I do not know how to confirm that he is my Robert. Any help will be appreciated.