Getting the key back is not enough, locks need to be changed and a doorbell camera would help.

The audacity in telling people they cannot get it on in their own homes while trespassing! If OP, fiance and Ryan haven't burn their bridges with Erica already, now would be an o-key do-key time to start turning on the flamethrowers already (Ryan's case might be a bit hard because of the kids but OP and fiance should have zero problems doing so). SMH!!!

Cut it with her, she is using the kids to for emotional bribery. The fact that you baby sit 3 kids free is amazing in the first place. You brother needs to man up and face her. I would also que a paternity test cos it sounds like your brother has no balls.

ok but I suggest there was some other reason why she was letting her self in the house in the middle of the night. Her explanation doesn't make sense. She was covering for being mad that she was interrupted in whatever her plan was. Does she know where you keep jewelry or money? Get a safe

Can't believe y'all stopped!!! Just keep going, tell her to leave the child in the basket by the door...lmao

They should ask Erica what the hell she's doing taking a baby out at that time of night - why not just leave the baby with its Father?

The most important question still needs to be answered: Did they manage to get back in the mood after the psycho girlfriend left?

Even if they'd been sitting watching TV, letting yourself into someone's house unannounced is more likely to get you shot than to get you free babysitting. That level of entitlement should lead to inpatient treatment

Change the locks, install security cameras without telling anyone you did ! Check if anything is missing or papers have been gone through. Erica doesn't sound like someone who would have a problem being a snoop or thief.

"fiancee" interjects calling Erica awful names, then is supposed to be the one who was doubtful? GTFOH

What even was her plan? If she expected they were home in any capacity to watch her child, why would she use the key to let herself in instead of knocking or ringing the doorbell?

Press charges against her for theft of the key and trespassing since she wasn’t invited to enter.

It is their house!! if it was someone elses house it would be a different story, but its their house that they pay for, if they want to get it on in the living room, its perfectly fine.

What would have been the strategy if they were upstairs? Would Erica have left the child on the living room floor and left, so the couple would awaken to a possibility crying child? Take the keys. Tell them to get wrecked. Erica is spiralling and nothing good will come out of giving in.

Change the locks and put a bolt on the door too! How dare she, late at night walk into your home unannounced!

So Erica and the brother are in an on again, off again marriage. She barged into your house at 11:30 at night to have you babysit an 11 month old child. Where exactly was she going that time of night? OP might suggest that the brother have DNA tests done to see if he is the father of some or any the three children.

I would have her a*s trespassed.

This is WILD. Do not watch those kids until she apologizes and admits she was in the wrong. Couples are allowed to do whatever intimate acts they want in the privacy of their OWN HOME (consensually of course). It is just beyond obnoxious that this other woman thinks she even has a leg to stand on. As far as your fiance goes - it's okay, sweetie. I get it. You just want to end the drama, she's gaslighting you, making you feel terrible. Don't do it. This woman is not right in the head. There's so much wrong here - walking into your apartment, expecting you to watch her kid without asking, insulting you. I've walked in on someone before, for like...a split second, I felt HORRIBLE. I felt like such an incredible a*****e, it happened years ago. The fact that she is insisting that she didn't do anything wrong is a HUGE red flag. I'd definitely be getting some extra security too, and if she doesn't call first, don't answer the door.