quietly ask the front desk for a room change and tell them why. I feel like most people would want to help get the honeymoon couple out of a weird situation if they can...

Tell your in-laws they may want to change rooms. Brain bleach is pretty expenses these days and what you're gonna do to their lovely daughter will require a lot of it!

This screams all sorts of Red Flags!!!! And also you literally described a scam grifters use all the time. Make sure all your passwords for your financial's stuff is extra secure. That whole situation seems rather suspicious.

I hate to tell you but this is what you married. There's no way this is the first time you've seen enmeshment. And it won't be the last. You married her mother too. You're going to be the 3rd wheel in your marriage

I second idea to change rooms, if it really was coincidence then the wifey shouldn't have any issues changing room or even a hotel. I showed this to my partner and mum, both agreed this is a hill to die on and I would consider going home personally. Great start to a marriage... I'd go as far as annulment as I can't comprehend why a wife or husband would want either families on their honeymoon especially without prior communication of this plan. Love is blind, but surely there were signs, I wouldn't be surprised if parents will move next door or in with you after honeymoon or baby if you having them.

Find out if your wife knew in advance. If she did, get an annulment. That pattern with her parents will never end.

it's your honeymoon, not the parents...they booked next to you, if your spouse doesn't make the noises, you make them twice as loud