I have wondered if it was a visiting cousin.  I have accounted for all the other children til death via census and death records.  I have not found another Julia but their life in Manhattan is a brick wall.  Sheehan is a very common name and spelled so many ways. Tragic to report but of seven children, five lived to adulthood, three died in their 20s, two married and only one had children--my gt grandmother who had two boys so no Julia.                  Thanks--Virginia From: Kathleen Scarlett O'Hara Naylor <kathleen.scarlett.ohara@gmail.com>   I have not ever found a dead person in the census. Could someone else in the family have been recorded as Julia? What other children did the family have, and are they all represented in the 1870 census? One of my biggest confusions was a totally unexpected additional daughter in my g-g-grandparents' family on the 1900 census. BUT, my great-grandmother was missing from the family. Eventually I figured out that she had been enumerated under her first name (little did I, or even her sons, know that the name she went by her whole life was her middle name) AND the enumerator had added a decade to her age (recorded as 13 instead of 3). I looked at a record for a 13-year-old named Anna and it never occurred to me that she was actually a 3-year-old I knew as Molly.  Or, since relationship to the head of household isn't recorded in 1870 (I think), could she have been someone else entirely (cousin, friend, boarder, hired help) who was accidentally given the last name of the rest of the family? I've seen that happen at times. Are there any other Julias at all who show up in Sheehan research?