Hugs for all who need them.
Chuk, at least you seem to be seeing things very clearly. The choice to stay or go will always be yours and whichever choice you ultimately make I can confidently assure you it will be the right one.
I do hope the news is good for your mum.
Freddie enjoy your break - it will give you the strength to pick up the load again when you return.
My next door neighbour was supposed to be dead from prostrate cancer twelve months ago. They are treating him with experimental drugs and although he is slowly going down hill, he still has a good quality of life, an interest in everything around him and a wicked sense of humour. He knows - as I'm sure your brother does - that every day is precious and he is living each one to the full.