Thanks for the help. We're not sure of their religion, but I do know that the youngest son was Catholic.
Tobermore of Londonderry appears to be the most likely choice. On the ship manifest, there was a group of 8 from Tobermore listed together that included the McSorleys. Other surnames were Peacock, Wallace, McKeever, and Graham. The only adult male was John McSorley (age 60) and there were 4 children, the youngest being Margaret Wallace (age 6 mos). Also, Mary Ann Graham (age 18) of Tobermore was listed with Jane Graham of Coleraine.
The first half of the manifest appear to be families from County Londonderry and County Tyrone; the second half are families from County Donegal (Malin, Moville, Culdaff, et al.)