OP,
Your brothers are greedy bullies and ceasing all contact is the best action.
My friend bought her parents house 20 years ago, again market rate.
Gorgeous house and garden.
Her parents lived abroad but would return for 2 weeks at a time several times a year and they stayed with her every single time and at times it wasn't easy for her lovely husband.
They never stayed a single night in the homes of her three brothers.
They then both had health issues and it was decided they should return home to the UK before Brexit.
Her 3 brothers were appalled that they were now not moving in full time with my friend to be looked after, leaving their inheritance untouched!
Her marriage would not survive this so they are installed in a lovely expensive assisted living flat and really enjoying it.
Her brothers continue to be "disappointed at her selfishness.
Three CF.
Her parents could live for years, despite their health issues, and they are getting great care.
The meanness of her brothers took even her by surprise.
They absolutely expected her to house them, nurse them, and give up her career to do so.
She actively avoids all three now.