My MOH is engaged and FI's best man is married, and they are the only people we've asked to be in the bridal party so far. I'm asking FI's BM to be a bridesmaid because we are really close friends, and I'm also going to ask another close friend of mine to be a bridesmaid, who is in a serious relationship. FI is only going to ask another of his close friends, who is in a serious relationship.
Do I have to ask to SO of the GM to be BM and do we have to ask the FI on my MOH and the SO of my BM to be GMs? I would like for the sides to be equal, and my mother says we have to ask both if they are in a serious relationship, but we barely know the GM and the BM's SOs and both my FI and myself dislike my MOH's FI.