You and your son are getting WAY ahead of yourselves here. And I suspect that’s adding to your stress and confusion .
Your son does NOT need to decide on his S6 subjects now.
I assume he needs to choose his S5 subject soon but thats easy, just Eng, math, biology , chemistry + one other subject that he likes and will be an easy A. It doesn't matter which one and anyway most schools have a little flexibility after results day.
He doesn't need to choose his S6 subject for another YEAR.
He doesn't need to decide on his UCAS application for 18 months. You and he both need to learn a lot more about it nearer the time, as you are not well informed - you can’t apply for 5 medical schools and Dundee and St Andrews are two choices. And anyway he cant decide where to apply in “ Oxbridge” until he has his UCAS score on 18 months. He will get good advice nearer the time from the school.
Your son doesn't need A* You and your husband needs to stop hounding him to get grades that dont even exist! He DOES however need to get better than AAAABBBB in his Nat 5s. But hassling him or moving schools or taking him away at Easter wont help that. He needs stability .
THAT IS THE ONLY THING HE NEEDS TO FOCUS ON RIGHT NOW.
Your own head is all over the place as well OP. You need to stop worrying about S6 and your sister’s marriage and social services and getting your husband to admit he’s wrong and phoning English lawyers and air BnB and trying to get a council house.
I know I’m being bossy, but you need to ONLY have two priorities
- your own mental health and well being
- stability for your son
So get a 2 bed private rental furnished flat in Edinburgh where you can afford it. You’ll be about 1400-1500 pcm at least but Remember you won’t be paying towards your mortgage or bills on the other house . Assume your husband will pay nothing in child maintenance.
Your son can get the bus to school. The paperwork to rent isn’t hard. Your friend can help you so you can move in a few weeks.
So no, not a one bed ( you on sofa isn’t sustainable ). Not an air BnB. Not a refuge or a hostel and not a council house. Just a straightforward private rental.
Consult a solicitor in SCOTLAND and do exactly what they tell you. If you both agree to the divorce you just need to agree on finances.
Get a counsellor for your own mental health. Stop playing one up man ship with your DH . Go grey rock and keep everything as calm as you can for your sons sake until you move out.
Of course, if he gets violent then you get out and call the police, that goes without saying.