How to ask

People not to kiss my newborn or touch her face? Also having issues with my MIL being pushy about being there for delivery and ontop of her my grandma and my dad who aren't getting along both wanna be there no matter how many times I tell them we don't want anyone there!! I even explained that my husband lost a son at 22weeks when he was younger so he is scared.
No matter what I say they don't seem to care, which makes me think me telling them no kissing her or touching her face isn't gonna work.....
The reason for no kissing her or touching her face is because my mil has cold sores, she gave them to one of her other hand children and I'm not gonna tell her no and not tell everyone no. Plus I don't think people need to be kissing a newborn.