Two Sisters and a Brother(possibility #1) or Two Sisters and One of their Husbands(possibility #2)

I found this photograph on the same day and in the same location as the previous post.  I don't know the nature of the relationship in the photo, but there are a couple possibilities of which I will explore the innocuous ones.  A. They are the siblings of one family:  two sisters and one brother with a very bushy beard and an aversion to mustaches.  His mustache aversion is either due to his religious, political beliefs, or his eccentric personality(I prefer this one).  Or B. A husband to one of the woman, probably the one on his left because he seems to be more comfortable with her, and her sister.

What strikes me as interesting in this portrait are the participants hands.  Maybe they are indicative of their personalities.  The woman on the left with her rigid pose and straight fingers.  The woman on the right with her polite, reserved, hidden fingers.  The man with two different hands for each woman.