Bridal party members, regardless of relationship status, get +1's no matter what. I get this and am on board. What do you do with adult sibs in the same house that also are attending, as guests? FI has an aunt with 5 kids, all adults. One is married and lives with her DH, 4 aren't and live at home. The boys are groomsmen, the girls aren't participants. They will sit with their parents & grandma. Having +1's for them would skew the #'s in the seating chart, but it is a faux pas on our part to not allow +1's for the brothers but not the sisters? Of course the wedding is in 8 months and anything could happen between now and then, I was just curious if that's a no no.