@@kmk2016
They were invited from the get-go, I'm just not keen on having them there. One is FI's sister, and one is FI's sister in law. I didn't really want his sis in law in the BP, but it was the right thing to do for a number of reasons so I just went with it. But her attitude stinks, so much to the point that FI said that if I wanted to dis-invite her he would totally understand (I didn't do it). And it is doubtful that I'll ever have a genuine friendship with his sister unfortunately, which is really a shame because I like her a lot, but his sis in law is the cause of that. The three of us get along just fine and we're friendly when we're all together, but we're not friends.
Plus I can't get something out of my head that his sis in law said. This is a second marriage for me and a first for my FI. So sis in law said (right in front of me when a convo about her friend was happening) is that 'people don't deserve to be celebrated when it's a second time around.' Totally fine if she feels that way, but saying it in front of me got me all messed up.