Unexpected guests

You could hire security to escort them out, or assign that duty to your wedding planner/coordinator.

My Doc and the venue know that if they are not on the list they are not to be allowed in. And those that are on the list and bring their children are not to be allowed in as well.

I'd definitely have a list and bouncer of sorts!

I agree with PPs. Security would be really helpful!

My Greeters and Hostesses have been told that if the name is not on the Seating Chart, then that person will have to leave after the Ceremony.

Yes I had unexpected guests but they were children -_- so I was like dam it aha luckily the parents say at tables where it was only 9/10 so I was very fortunate there was seating. I got kind of annoyed BECAUSE I DID INVITE THE KIDS but the parents were the one who RSVPd no for kids and they came with them like "sorry.. hope you don't mind I brought xxx" well she's already here and she's five what can I do or say ahah. But I've heard of tons of stories from my married friends about how at their wedding they had to roll out extra tables because that many unexpected people came.

This is my greatest fear 😭 If his fam is known for non rsvping I’d reach out after your deadline to confirm if they’re planning on coming. It’ll be a pain but at least you can try and get an accurate headcount. If you haven’t sent your invites yet, try putting we have reserved ___ seats in your honor. # attending: __. We did that and honestly a few people are still asking if they get a plus one or not (🙄) but for the most part it’s gone over well. Some (who actually read the card) complimented that it was super clear and they didn’t have to awkwardly ask if they can bring someone. If you can have your coordinator or someone check names at the door that can work too! And lastly, if they’re known for bringing extra guests, maybe just have a conversation with a few people from his side and hopefully by word of mouth people will get the message