Sorry for delay in replying had internet problems all week
Not surprisingly the more info that comes to light the more questions occur to me.
Need a little clarity of your last information. Were Marianne and Christina sisters of Euphemia or as you suggested earlier, maybe other relatives eg grandchildren of George and Jane or perhaps nieces of Euphemia? I thought it also interesting that Christina was born in Ireland, the only one of the family that was although I couldn't find her on Familysearch. And Jane Dunn where do I start with trying to find out how she fits in?
You stated Christina married Bowman Steven but I'm guessing that was a typo and you meant Christian (b1814). I have tried to search the Familysearch website but their new site is nowhere near as easy to use as their old site. I can see individuals but there seems to be no way to find "households" as there was with their old search engine. Maybe I'm just not seeing the logic they want us researchers to use. I tried searching by film number but again it just lists individuals and there seems to be no way to discover the "relationships". I can't even find the Christian/Bowman marriage on there. Frustrating to say the least.
I guess I'll just have to shelve my research on this line until such time I can resubscribe to Scotland's people. Thanks for all your help.