I Had a look at your first post and I don't think I can help you on this right now, as I only got started recently and am back just about 5 or 6 generations and lots more to get done. Perhaps I'll return to your post later. Still a work in progress and still have to research dates etc, but so far back as the Boswell family goes I only know back to Abraham & Unity Boswell likely born late 1700s, with next generation Ephraim & Ann Boswell born early 1800s.
I have come across the reference that you made to Mary Ann Paul though with marriage 3 Sep 1866 listing the groom as William McDonald 29 mariner of Jack Lane (his father John McDonald-labourer) wed to Mary Ann Paul 28 of Jack Lane (her father John Paul labourer) witness Jabez Shepherd, Susan Warren.
My note on this at this point is; I have not found a connection to this part of the Paul family in my research so far. The furthest back I have proof for in my family tree is John Paul 1817-1860 And Margaret Harvey 1815-, and I have not found a connection so far past that point, nor is there a mention of Mary ann Paul within their children on a census.
So sorry I can't help you on this right now, but be sure I'll be back to you if I find anything on this. Happy hunting.