my brother is very rude to people , most of the time he gets into arguments with my parents, but my parents are very loving and kind, they have never brought us up in the manner my brother acts in.

he has no consideration about my parents feelings, although he has a good knowledge on buddhism, when it comes to dealing with things he is very mean and ungrateful.,  he speaks of wisdom but practically he is no good

my father loves him very much, helps out my brother financially and supports his cause. yet once my brother gets what he wants he will treat them like trash.

my brother never seem to find good friends with values, he is just attracted to these people who are rich, arrogant ,narcissistic and manipulative, who pretend to be on his side just for the benefits.

He has been used by his so called friends and he never accepted it., even his wife is mean like him,

they constantly hurt my parents,

he is selfish and arrogant. He is all nice and dandy when he wants something done. afterwards humiliate my parents.

I can’t stand a side and watch this, I need to act but how can I help my parents to understand the true nature of him and set boundaries.