Did Extended Kin Immigrate?

My Irish immigrant ancestor was born in the 1830s and died in the United States in 1912. In 1935, when his great-grand-nephew was born, the place of birth for the mother told me where the family was in Ireland. For those whose family immigrated over decades and generations, records on the more recent generations may contain more detailed information than earlier records on the “actual ancestor of interest.”

Place names may not be spelled correctly, but Limvady was close enough for me to locate the actual location.