Luckily dh feels the same way, and i told him that there is no way we are sleeping over there. I cant even put lg on the couches to play, never mind the floor!!! So what, shes going to be in the arms all weekend or in her cot or in the pram?? They were never this way, but since SIL had her baby (the 3 year old that is not potty trained) they just dont give a sh!t. He does what he wants, hence he is still on nappies, the house is always in a mess, its just gross, and even dh said that he doesnt know whats wrong with his mom and why she allows it, she wouldve never let them be this untidy when they were kids!!
Think he must just tell them that they can come visit us for a sunday or something. No sleeping over, lg is in her own space, and my new dishwasher can clean up afterwards!

If she wants to know why we not going to sleep there, he can think of something, or even better, tell her the truth, maybe she does something about it??