Long post!! There has been a big debate with me and my FH on our wedding party. We are very close to our families, and the last thing we want is for someone to feel left out so we cannot make a decision. I was hoping to get a third party opinion and brutally honest advice!
We have my sister, and my brother and his brother (The three of them are best friends) in the wedding party, as well as my nieces. I am not including his brothers wife or his sister because we are nowhere near close enough.
My sister is my MOH, I asked her about it and her advice was that I should have her husband (they have been married 10 years) and my brothers girlfriend (They have been together 6 and I believe they plan on getting engaged soon) in the wedding party, but in the end it is my decision to make.
I am very friendly with my brothers gf, we text once in awhile, the 4 of us have gone on a vacation together, etc. However, I am not sure I would consider her a close friend. I do enjoy her company, she is a great person and we get along very well, and if I included her I know I would not regret it, so that's where I stress about her not wanting to be left out.
My FH and brother in law again, are not close. My sister said "he's part of the family," but they don't have that close of a relationship. I feel bad since his wife and girls are in the wedding party and it would be weird to exclude him since he has been in my life for 10+ years. But I also found out that he is basically expecting to be in the wedding party which is more stressful!
I know it's family and often they usually are included in the wedding party, but also my day so I should do what I want, but I really can't make a decision. We already have 6 on each side which is bigger than we planned! Me and my FH have agreed we do both or none, but we still can't make that decision. Advice? 
