I am a pretty outspoken (and stubborn) person.  I don't know if I should bend on this one, or stick to my guns.  FI & I want a smaller wedding - about 100 people.  My mom could easily come up with 100 people she would like to invite, but upon whittling her list, she is stuck on inviting her first cousins (7 of them with spouses).  These are people that she grew up seeing, but that I have only seen at events like weddings and funerals.  These are not people we see at holidays or just to get together with.  Weddings, funerals, that's it.  
That being said, one of the 7 screwed my sister over during her wedding and would not be invited (mom agrees).  So we're down to six and mom says one will definitely not come.  So assuming that, I am now down to 5.  One of these is my mom's favorite and I like him as well and would want to invite him.  One of the sisters I do not like, but can tolerate.  And, then there's these 3 others that I have no feelings towards either way.  My mom said I HAVE to invite them all (she is under the invite one, invite all because they're the same relation).  She has said that if I do not invite the lady I don't like, she simply won't be able to face her ever again.  Now, this was all said in the heat of the moment and she has since come back to me and said to do what I want, it's my wedding.
I am close to my mom and don't want to hurt her.  I also don't want "strangers" at my wedding that know NOTHING about me personally or what my life is all about.  I am not inviting certain co-workers or people I run with on a weekly basis and I would much rather expand my guest list in that direction if forced to expand.  Those people at least know me to some degree.
My mom offered to pay for their spots and offered to give up inviting friends to have these relatives attend in place.  However, I like my mom's friends and they actually know what's going on in my life through my mom and some even watched me grow up.  Plus, my mom has WAY more fun with these people and sees them regularly.  I know she would rather spend the night with her friends, but she's so stuck on not offending relatives that if forced, she'd choose that route.
I feel like we'd be ok if I just went ahead and invited none of them.  It's easy to say it's a small wedding and close family only.  They'd consult with each other, find out no one was invited, and likely be ok.  However, I would like to invite my mom's favorite, but feel like that could create tension among all the sisters not invited (women, I tell ya...)  AHHHHHHH!!!!!!!!  I don't care if these relatives hate me, I just don't want any of them to get mad at my mom over this.  It's not my mom's fault her daughter didn't invite them!                
                