AITA for not wanting to invite my moms to my wedding
This is other people
I think it’s reasonable to give your mom a +1, if you haven’t already. Past that, she can pound sand. NTA.
This is the answer. She can bring ONE person as her guest. That’s being generous. If she’s not happy with a plus one then she can remove herself from your happy day.
NTA. However, since your mom is single and won’t have any family in attendance, it would be lovely to allow her a plus 1. Or be sure to have some get togethers with her and fiancé’s family starting now so they can become friends. Your mom is also probably concerned that she’ll be seated with a table full of strangers, while your dad has a table filled with family and your fiancé’s parents get a table full of family too. Sounds like she is trying to fill her table with chosen family so she doesn’t feel like she stands out as a lonely unwanted old woman. Try to solve that problem.
You should at least allow your mother a plus one so that she can bring a friend to hang out with. It would be very uncomfortable for her to have absolutely no one and that is basically what you are doing to her right now. You are making her an outsider at her daughter’s wedding. You might even consider allowing her two guests.