Ok. That's quite a week, I'm sorry to hear about your brother and I hope he is receiving the support he desperately needs. Hopefully he will eventually feel strong enough to make decisions and choices that are fair to himself and his family.
Sometimes family members are going through life changing decisions line this. It's really hard because there's really very little you can do other than there offering support.
With regard to your son, secondary schools do this a lot. They seem to put lots of groups of kids together but there are always a few that are with no one. They find themselves completely alone in a class of strangers.
Was your son allowed to put a name if same he wanted to be with? Normally unless that child also nominates your child they won't be together.
This is why these taster days can be more stress than they are worth. They can cause a lot of stress to a parent and child from here to their September start day.. Even worse, if you call the new school to say anything, they will probably be unable to do anything. Ours would not have done a thing frankly.
I would approach it with a 'new year, new school, new friends' outlook. Turn it around, tell him that he will see his friends at break and lunch times, the rest of the day will be about making new friends.
Unfortunately, the reality is that very few primary friendships survive the transition to secondary school. I found at secondary school in general that a lot of friendships are made that last a lot longer.
I would also take the opportunity to consider what out of school activities your son does, if he is sporty can his club offer stuff over the summer holiday? Building a friendship base outside school is just as important as the one they have at school.
With regard to the house, you need to communicate by email with your tenant. Do you have a letting agent who can do this? Is it worth taking on an agent now who can deal with this for you?
Work issue sounds stressful, you can either go in and go to your gp? He may well assess you as having stress and recommend you have some time off work.
Would you get sick pay? Or would that make finances worse?
Not really sure ive helped really xx