Brother who cares for Mum is behaving like a martyr

I live a long way from my elderly Mum who has sever dementia and multiple health issues. My brother is behaving like a martyr, claiming it's worse than a full time job looking after her, and that his washing machine is on 24/7 which is nonsense. I think he is also mismanaging her finances under his poa, and he is drinking a lot. In fact whenever I go to see my Mum (monthly) there is hardly anything in the fridge and my Mum is very frail and thin. Fortunately there are visiting carers and meals on wheels too, but it's all a worry.