OP my nan used to tell us our mum was making a rod for her own back with my brother.
My nan is no longer alive, but her words have come true.
My 39 (nearly 40) year old brother still lives at home (well actually he lives in our former 3 bed family home, whilst my parents live in the extension they built next door).
He pays the princely sum of £100 per month, pays NO bills, has mum cooking for him, doing his washing, buying his lottery & food etc.
He also owes my parents and the back money, despite his laughably minimal expenses, and the fact he has a well paid job.
The other week my dad got locked out of his car at my house. He phoned mum, and she said she would get my brother to come over with the spare key (both my parents are disabled, so walking not an option).
I had to go to work, so assumed things would be fine. An hour later mum phoned me to tell me my DB refused to get out of bed, as he was agnry with my dad for not going to view a car for him (DB already has a car). So I had to leave, get a lift to my parents, get the key, then come home to give it to dad.
Despite this my parents still got my brother drinks and lottery the next day!
Don't make a rod for your own back OP!