It is your birthing experience. You should have the people you want to be there. It is OKAY to tell your mom or dad or your in-laws, or whomever, "I appreciate that you want to be there, but it will just be <insert the people you plan to have there>. I will be happy to have you visit and meet the baby <insert the location/time frame you are okay with>.
And, just like with any time you are dealing with family or even close friends, you have to be strong and consistent with your decision.
It's also okay to say you don't know yet, but if you decide you are okay with them being there, you or your significant other or birthing partner, will text or call them to let them know they are welcome.
Peace. ☮