m123, welcome! We're glad you're here!
So your sister thinks only your mom has BPD, and your mom insists only your sister has BPD. What an interesting dynamic!
Congratulations on your upcoming wedding.

We've had several members here that have gone through wedding preparations with a BPD family member. We'd be happy to help you brainstorm solutions, if that would be helpful. We're also a good place to vent should you ever need to.
Let us know how we can support you.
