Getting on with things here, although little things S16 says make me feel awful.

Yesterday he jumped into the room after practising his trumpet (he was playing Xmas carols) to announce that he'd set a goal for next year:

To play notes as high as his school trumpet teacher can play (apparently high notes are more difficult and S16 wants to be first trumpet in the school band).
I felt sick. He won't even have a trumpet next year (as it belongs to the school) let alone lessons.

On Saturday, because she wanted to go out late that night, D18 caved and rang XH after long NC because he'd put a block on her phone and she couldn't put credit on it.

He was nice and said he'd put $20 on it for her, but changed the conversation immediately to ask - this and only this: "Can you go and check on the top of the wardrobe in your mother's room to see if you can find my guitar case."

She didn't have to look as it was not there.

Next day, she gets another hurried call, saying he's sending his brother and nephew around NOW to our house to find the guitar case. We have only seen them once in the last 3 years.

D18 was like: "Whaaat?" She had the presence of mind to say that we were going out and he eventually backed down.

When S16 heard he was absolutely furious about the weirdness of it.

I suspect BIL and nephew were helping XH move furniture out of OW's apartment and driving it across to the new State that he is re-locating to.

XH's last day here and all he wants to ask when his kids are on the phone is: where's my god--mn guitar case.