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human
[Back to the Future III] Why does Maggie McFly look like Loraine?

In Part III of Back to the Future, Marty goes back to 1885 and meets his ancestors on his father's side of the family: The McFly's.

So, why does Maggie McFly look almost exactly like Loraine McFly? 

Loraine's maiden name is Baines. She's not related to the McFly's at all, as far as heredity is considered. 

Is this just a result of Marty's time-warped mind trying to make sense of what must be a very "heavy" week? Or are the McFly's and the Baines' more closely related than they thought?
gpt
Seamus and George McFly obviously have similar taste in women.
There's also the chance that Loraine and Maggie are related to each other besides their husbands as there's no mention of Maggie's family which she left in Ireland, after Maggie and Seamus settled in other family members could have emigrated as well.