Zoo personally I would try keeping DS busier rather than allowing him to spend too long on the PS and phone upstairs, as they give him too much time to overthink on his own, dissect the day and focus on the negatives. By all means allow some time to decompress on the PS/phone but you could try other things that would keep him busy without allowing time to overthink the day e.g. a board game, Lego, craft kit, a walk or do you have a trampoline or exercise bike or something similar (whatever would interest DS). CAMHS would also probably suggest removing the phone at bedtime.
Runner Lovely to hear DD3 managed tuition and therapies this week. A shame about the 5 hours, from the bits you posted here the wording is rather woolly which I think it probably the sticking point. Having been through it previously I can understand your worry for DD2, I hope the GP appointment goes OK - ARFID is an ED.
If the tuition centre won’t do AQA exams you could ask local schools if they accept private candidates, a few in your LA do. If you do this I would start with schools that already offer sociology as they are more likely to accept private candidates for exams they are already running. Some will offer access arrangements if you book early enough. If you know anyone in the EHE community they may know who takes private candidates, too. Alternatively Tutor and Exams offer GCSE sociology but I think your nearest centre is in London. Access arrangements are offered there if you book early enough.
You’re right about EOTAS being more work. It’s a couple of years away but we have tentatively spoken to our LA about GCSEs. It may be possible for DS1 to sit them as via the local hospital school service or a local LA SS, but with home invigilation. If not we will have to look at other centres.
DS1&3 cope reasonably OK with Christmas if we manage it well. They need to know the plans and outings/visitors need to be carefully managed. We wouldn’t take DS1 in particular to anywhere busy over the festive period as he just wouldn’t cope, not that we take him to busy places anyway but more places are busy at that time of year.
This year we are hosting a friend, my brother, SIL and DNs as well as SIL’s DM. DS’s know everyone well except SIL’s DM so I’m hoping it goes well, and if DS1&3 need to escape they will be able to. DD2 loves cooking, plans on taking over the kitchen as she often does when home and is planning the menu!