But what child should need to go to another house for respite from their mother?
and yes she is draconian. taking all his toys away because of the mess? That is the light switch for me. She is obviously trying incredibly hard to control the few things in her life that she can (DS, mess etc)., and him wetting himself is such an obvious affront to this area of control....If it was ONE party, ONE day of no toys etc etc., it still wouldn't be the right response to this particular problem, but it would be more human/understandable. But my understanding is that this is not an uncommon occurrence.
She desperately needs help, BUT that is not her son's fault, and not something he should have to put up with. It's interesting, in another thread on here, about a DH who is generally abusive, no-one has suggested that when he does something nice/normal/is affectionate, that this in any way negates his behaviour the rest of the time. I feel this is the same. Just because she is proud of him, hugs him etc etc., doesn't mean the rest is normal or acceptable. If anything surely it's even more difficult for a child to untangle his emotions/his mother's messages, when she is so all over the place.
Deany - you said your aunt saved your sanity, I suppose I just can't see how you can leave him in that situation where you think he needs the same sort of saving.
It's difficult to tell from euphemisms like "they have a difficult relationship", but it sounds as if there's a whole layer of crap under there that is being suffered in silence.. by her, by you.. by her son. But he's the only one who isn't in a position to do something about it.
Practical help is saying that someone, somewhere has to grit their teeth and deal with the consequences, and help HER. She might come out of her corner kicking and screaming, but just because it would be unbelievably painful to confront, does that mean leave it?
As to the original OP, I think you can have a nice day out and a great tea, and it will just be part of what you do at your house, no dramas.