Hi Martha
I've just re-read the posts on this one, and realised that I'm not clear what you are trying to find from the subsequent posts

Is it the marriage of Alexander only? Do you know for certain whether he did get married and have children?
This looks like Alexander with father Hugh in the 1881 Census:
Hugh McFarlane 48, shipmaster, b. Kilfinichen G, Argyleshire
Alexander McFarlane 23, seaman, b. Assynt
John McFarlane 46, brother, seaman - retired, b. Kilfinichen G, Argyleshire
Anabella McLeod 21, servant
John Turner 19, nephew, seaman, b. Glasgow
Address:Lochinver To Inverkirkaig, Assynt
Regards.
Monica