Delivery room

I don’t want anyone except my husband in the delivery room with me but over the holidays the in laws and his side of the family were already inviting themselves. I almost don’t feel like telling anyone when I go into labor because if I do, I think they’d just show up and demand to see me. They’ve been very vocal this whole pregnancy about what I “can/cannot” eat which their opinions are very dated. Ex: no seafood. I don’t want to deal with their opinions when it’s time to birth my child! Any way to deal with this?