Our Bridal Party itself will have few extra people that they'd want to sit with, save for maybe two of my BM's plus ones (I don't even know that they will bring one yet) and then my FSIL and her Husband will have their two young ones with them. The young ones LOVE FH's parents though, and his parents aren't big on dancing so would it be okay to have them over with FMIL/FFIL as long as they're okay with it?
I'd mentioned a sweetheart table to FH but he really likes the idea of a head table, and it's one of the few things he has had a huge opinion on so far so I'd hate to take that from him...