Yep. BM#1 has been in my home for celebrations for SD. (Long story, but I raised her more than either bioparent.)
My XH was in my home about 4 months after we split. (He had tried many times before that, but I changed the alarm code on him!) He and the kids always did pumpkins together, so I invited him to come hang out with them in the garage and keep up their tradition.
Yeah, I let my guard down, and I caught the shithead in my bathroom...which was where my jewelry box was. Not unsurprisingly, my 5 carat wedding ring disappeared, never to be seen again...
No more invites for him.
BM#2 has never been in my home. Would be funny, because I know she'd be jealous as all get out, but I'm 110% confident SD and SS reported back to her how nice our home is and all the "stuff" we have. Little shits that they are.

I've been in BM's and she in ours. Skid celebrations, and one year we invited BM and her BF over for New Years Day dinner, just to show the kids we could all get along. that was about 4 years ago, haven't done it since, it went okay actually. We've been in her house more than she in ours. When we pick up the kids, she or her BF come out and invite us in. We all talk, get along, but I don't trust her further than I could throw her. So I'm always on my guard in what I say.

My exh and his mother came into town a couple of years ago. My DH is so nice, he picked them up at the airport and brought them to our house, left them with me and went to work. I made everyone breakfast and DH was so wonderful about the entire thing. He said he did it for DD, who never gets to see her father.

Three years ago we moved to a new house. Exh has not been to this house and when he comes into town I meet him somewhere. But SD15 insisted that BM see her room so I reluctantly allowed her to come in for a few minutes while DH was at work. She will never be allowed in again but I did it for SD because she really wanted BM to see her room.

Now me and DH are even and no one is allowed in anymore!!! It makes me uncomfortable!!

When SO was living in a rental house, BM believed she was entitled to come in SOs house when he was not there. One time SOs daughter forgot something at his house, so BM drove her over to get it. BM took the opportunity to walk through the house. Then she sent SO a text message pointing out a few new things (washer & dryer) he had and saying apparently he is not paying enough child support or alimony because he could afford the new washer and dryer. Grrr...

He got the family home back after the divorce was final and he immediately changed the locks, but I don't know how you keep her out if SOs daughter has a key to the house.

My ex and his wife have been in our house several times and us at theirs. We all get along pretty well (even vacationed once together). We do it for my daughter. Typically just Christmas and her birthday. We'll do one big celebration together in the spring for her graduation. Now DH's ex is another story. They do not get along at all and she can be quite nosy. She doesn't come into our house nor we in hers. Unfortunately, we cannot trust her to stay out of our house when we are not home so SD does not have a house key. That makes things a little more complicated at times but is for the best.

Yes. They are both allowed to come in as far as the entry way while they wait for the kids. If they are taking an excceptionally long time they can sit down on the couch. It doesn't bother me at all. As long as they don't help themselves to the rest of the house (which BM likes to do). I have no issue. If they want to come in and see how grown ups live... come on in

Yeah my exH comes in from time to time but usually doesnt venture much past the front door on pick ups, only when our youngest had his adenoids and tonsils out did he come in and stay a while, SO was not impressed but dealt with it, I have also been inside exH's new gf's house, (he moved in with her recently) again not really past the front door but I felt that at least she doesnt think i am a psycho out to cause her trouble (which I am definately not!!) like most of the BM's I read about on here LOL. SO's ex on the other hand, not ever likely to come to our house so I dont really need to worry about her, I would prob not be impressed but like my SO would have to deal with it for skid, but since he never comes to our place, not likely to ever have to deal with it!

BM comes in our home to sit down and discuss issues with SS17 and I hate it. She lived there for 20 years so I think she feels kind of like she has the "right" to enter. She would make comments to DH "oh, I remember that" when she would see something familiar.

BM has been giving us some trouble lately so I am not feeling so hospitible any more and do not really want her in "my" house again.