This Dennis O'Donnell is your man if:
- he was born 4 Jan 1878
- his wife's name was Catherine, born Ireland on 16 Jul 1878
- children were James, Michael, John
The passenger list indicates that he is going to his uncle, Neil O'Donnell, who is listed in the 1895 Boston City Directory as living at 3 Snowhill Pl., which matches the manifest address. Also at that address is John O'Donnell, a laborer.
In the same City Directory, there is an Owen O'Donnell, a laborer, living at 1 Snowhill Pl.