AITA for not babysitting my brother
I am a 28 year old man and I have 2 kids (2) and (5).
There mother is not in the picture.
I am a biology teacher with 2 children barely getting by on my current salary and my parents call me asking to look after Devon when they go away for a weekend trip. However this isn't the first time this is there 3rd trip this month and I can't afford to keep hosting a 22 year old unemployed man in my house. My children are afraid of him, he steals from me and always uses my stuff without permission my parents have a household income of around £150-200K a year and can absolutely afford to either bring him or hire someone to look after him however they keep sending him to me with an income of £56,000.
My parents continue to blame me for my brother's failures as he finished his highers with a fail in human biology (the subject I teach mainly) and they continue to blame me despite me not even being assigned his class.
Have I been to harsh by not letting him stay again?