Is it proper to include a boyfriend/girlfriend of the maid of honor/best man at the reception?

No you were not being selfish, just think it was your wedding....so whatever you said or planned should have been followed....Please put this behind you and know for future parties that you will have to make it clear that whatever arrangement that are in place are to be followed....especially if you have the MIL involved lol

As the bride your seating arrangements should have been followed. I don't blame you for being upset that you couldn't sit with your sister because someone manipulated the seating chart. At this point there isn't much you can do. Just let it go.

ADD: I made sure to include all the wedding party's dates at the head table so no one would feel excluded. Hearing this story makes me think I did the right thing.

How to deal with completely insecure people?? First, do not allow him to include his wife. Just have him walk alone and have your sister walk alone. Simple solution. Yes, those two have an odd duel insecurity problem and it is very weird, for sure. But, not so weird that it cannot be worked around. Kicking him out of the bridal party is kinda harsh when there is an alternative to compromise. But, if you are unwilling to compromise and have him and your sister walk separately, then you do have a problem and may need to ask him to step down. However, under NO circumstances would I include his wife in walking down the aisle directly before or after your wedding vows are to be exchanged. THAT really is bizarre.

First of all it's YOUR wedding. I have been to many weddings where the wife/gf of the best man sits at a separate table with other guests. It encourages mingling. The best man frequently visits his mate and checks up on her throughout the night. Most people don't stay seated the entire time. The wedding party poses at the main table, toasts and eats there...after that, everyone is free to roam.

Well, at this point it's really not worth being upset. But, they should have gone with whatever the seating arrangement you planned was. For my wedding the head table for my husband and I and our wedding party, did not include spouses or significant others of people in the wedding, unless they were part of it as well. I made sure to sit their significant others with people they would know or with people I knew they'd at least have good conversation with. Besides, the only time you're really sitting is during the major dances and the food, other than that they were free to roam and be with their spouses, so none of them found it to be a big deal.

I would have already expressed my anger. How dare he push the maid of honor to another table. Not his right. Had it been mine, girlfriend would have moved her butt right when I walked in. I would have embarrassed her to death (and the best man) for changing my seating arrangement. Tell MIL to shut up. Actually, hubby needs to do it since it is his mom, but if he won't, make her stop before there are kids she is controlling. I guess I am one of the lucky ones. I love my MIL. She is sweet and does not butt in most of the time, every once in a while.

At this point, there really is no sense is staying mad about this--it's over and done with.

However, you really shouldn't separate significant others just because one is in the bridal party. In all honesty, that's rude and inconsiderate. Put yourself in their shoes...how would you feel if your husband was in the bridal party and you weren't and then seated away from him in a completely different table. It all makes for a not fun night.

Technically, you shouldn't break up significant others, so yes, it was rude to have them sitting separately. Yes, I think head tables are rude. They are a social unit and should be able to sit together.

My advice: get over it. It is over, done with, you are married. Don't you have anything else to worry about?

Typically the significant others of the bridal party will sit elsewhere, not at the table with the bridal couple and party. Sorry to hear about your MIL... sounds like a true nightmare!