You don’t say what the SN are, so it’s difficult to know what cognitive level, they are at and what works.
However, we have just had DD at home for 7 months. We found positive reinforcement to be the only way forward. Her main motivation in life is food.
She is obsessed with a TV series. I only let her watch one DVD a day, or else she goes into a trance and loses skills. She refused to have a bath or brush her hair, despite wetting the bed at night or herself in the daytime - this because Maxi incontinence pants could not cope. I would say she could watch her DVD, after a bath and brushing her hair after breakfast.
We tried to get her to go for a walk in the afternoons - pulling hen’s teeth is easier. If she went, I promised to cook her one of her favourite dinners.
We ignored verbal abuse, but told her firmly to stop hitting us. After dinner, we have a small dessert like 2 biscuits - if she was being really difficult like refusing to get out of the car, we’d say “No biscuits tonight!”
She tended to get up between 3.30 - 4.30 am, and put the television on, which disturbed our sleep. It’s pointless telling her not to, as she forgets what we say due to extremely poor memory. Anyway, she will only do what she feels like! Then she fell asleep in the daytime. We tried to take her out every day for a walk - then she slept until about 7 am. We did not let her sleep for more than an hour and a half in the daytime. The GP from her care home told me to buy melatonin and give her 2 mg a night - but we didn’t need that, once we found taking her out every day worked.
However, after 7 months, we were exhausted and sent her back to the care home, even though we know she can’t come home at Xmas, we can only see her on timed visits in PPE; and it’s in a Tier 3 area - she could get Covid and be refused hospital treatment. However, the stress of looking after her is too much for us long term.
Can you get supported living or residential care for them? It is in their best interests if you live as long as possible. The stress of caring for them 24/7 could shorten your life?