To not want friends Mum to come away with us?

[SimonLeBonOnAndOn]

I have 3 friends, we are all pretty close, although I am probably closer to and B than C.
We go away for weekends a few times a year and have a good time, all get on, easy company.
This summer we have a long weekend planned, and were chatting abou where to go.
C then says that her Mum has asked if she can come.

Am I awful for not wanting to go if her Mum comes.
I know her Mum and like her but I don't want to spend a weekend with her.
If her Mum comes I'll feel obliged to ask my Mum, which changes the whole weekend.
C sees her Mum a lot and they spend every holiday away together.
Friends A and B have said they don't mind, although would rather she didn't come.

So AIBU for saying that I won't go if Cs mum comes too?

Thanks whois. I am going to practice that line.

I have no problem with mums coming on hen nights, at least for the meal/early part. Although if I ever got married, I wouldn't have a hen night!

I do think it is cheeky though to ask if a mum can come on a friends' holiday. I would just decline. I love whois's response, but I think if you use it you may be creating friendship issues down the line.

I don't see why there should be friendship issues down the line unless friend C is an unreasonable person who can't understand why her group of 3 friends don't want her bringing her mother along as the only guest in a friends away weekend in which case she's maybe a friend you'd be better without any way.