I have never had this exact thing happen, but I have had PLENTY of experience with my ex's ex breeder wife who had 3 other kyds from different men try and dump her oldest boy, who my ex had "step fathered" for a few years, on me beginning when he was about 8 years old and the step daughter was 3-4. She actually had the BOY ask me if he could live with me so his moomie could "get her life together", after one of her divorces or breakups. This went on (his begging to live with me) until he was about 14. He had already decided that I could turn my office into "his room" and was full of pitiful reasons that he would "be no trouble". The husband actually TRIED to get me to consent and the conversation went something like this.
"Ok look. I signed up for 2 days every other week and NOW YOUR daughter is living here full time. I will NOT raise any more of your ex's kids as that is not the reason I was put on this earth. IF I had wanted kyds then I would have given birth a long time ago. Absolutely not, and if she just dumps him on the carport like she says she might and drives off, then I will pack my bags and go to a hotel until I can hire a lawyer to file for divorce, and that's AFTER I call CPS."
If that had actually ever happened though, no matter who I called the ex would have said that he had allowed the kyd to "visit" to avoid his being put in foster care. I basically would have been forced out of my own home because there were two minor children living there, which is one reason I didn't leave any sooner than I did as he had a "chylllllld" and I wouldn't have gotten SHIT AND lost a place to live to boot, but would have still had to make the house payment. To force the sale of the house or make THEM move, would have never happend in a famblee court in Alabama, especially when I was "childless" and the one who had left. However, if a breeder relative did that now, with neither me or the husband having any "step parent" ties to worry with, I would first call any grand mee maws or pee paws and tell them to either come get their grandpups or I was calling the police, and then I would follow on through with the threat if they didn't come get said grandpups IMMEDIATELY.
I absolutely would NEVER allow myself to get in the legal position again to be a boarder in a home which I owned, an apartment that I rented, or even a tent that I pitched. It sounds like an easy concept now that I am away from it, but if you have never dealt with breeder entitlement mentality, or "for the chylldren" attitudes within the legal system, it's all new to you. If minor children live in your home, or one spouse says it's "ok" and they are related to said kyd, (in Alabama, even after a divorce the "step" relationship is NOT severed) the other spouse is forced to either stay there and endure the torture, or move and lose a place to live, WHICH THEY ARE STILL LEGALLY BOUND TO PAY FOR, and possibly lose all equity in their home. NO famblee court will force an adult with minor chyldren under his care, for whatever reason, to sell or move when it's a "childless" adult who wants said kyds gone. I should know, I lived that fucking existence and it took a lot of skill, patience, and coniving to get the fucker to sell that house voluntarily and for me to get my share of the profit from said sale. I still don't think he knows what hit him and is stupid enough to think it was HIS idea to sell. What an idiot, that man.
This would NEVER happen to me again, never in a zillion years. I am leary of even letting a child come and visit me overnight for this very reason, even though I doubt the parents I know now would do this, but I NEVER DREAMED it would have happened before either. When minor chyldren are involved, you can NEVER be certain of what might happen, so it's best not to ever even let them roll a sleeping bag onto your den floor. Sad, but a very true reality.