Whooping cough shot and visitors

Mercedes • Mommy of one amazing little boy and girl and #3 on the way 😍
We have made the decision this time to require everyone who wants to come visit our baby to get the TDAP vaccine. 
I am having a difficult time trying to figure out how to enforce this as I have family members that like to just drop in unannounced. I know that we will have this problem both at the hospital and once we get home. 
I would like to know if anyone else is planning on doing this and also, how do you plan on making sure no one gets in without your permission at the hospital? 

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