Mom as Moh?

Step back decide what you absolutely want and don’t want. Don’t feel like you have to pick people just because your fiancé is picking people they are close to. Never ever pick anyone out of obligation who is not a ride or die best friend forever as a bridesmaid. The same goes for asking a sister in law that you are not close, thinking that the planning period will be the optimal time to get to know each other, because it doesn’t work that way. There are many past posts on the search feature (magnifying glass at the top right) listing bad experiences with this exact scenario that destroyed friendships, including asking the wrong people too early. No one needs to be asked before 6 months before the wedding for that very reason.


As for the sister in law, because you and her are not best friends, she should stand with her brother or she can be a guest. Every single guest does not need or wants a role, which is a controversial take but has only been in effect for the last few years. If everyone is honored, then no one is.
There is nothing wrong with asking your mom only to stand with you. And all the others can enjoy themselves as guests which is more fun anyway and doesn’t have the extra emotional and financial burdens that not everyone is able or willing to work with to attend.

I think it's a super sweet gesture to have your mom be MOH

Totally fine to have your mom stand with you!

Sides don't have to be even though, and the don't have to be divided by gender. Look at the people closest to you.

That’s totally fine. If you and your mom have such a close bond, it makes perfect sense.