Npd again- my brother

Yesterday i posted here questions whether i have Narcisstic Personality Disorder and thanks for your replies i glad i am normal. but iam not quite shure if i can say the same about my brother with whom i dont speak for last few years.
please read and tell me what do you think about it

when he was kid he was agressive againt girls at school, their parents and teachers complained about his behaviour and he was recomended to visit psychologist. he was very clever and sold his birthday gifts to kids for lot of money,then their parents knocked on our door and wanted money back,when he had a scooter and other kids no he'd let them use it for money:-)he was just 7 years old.
he constantly damaged my toys, my diaries, ate my sweets i got for gifts, and was agressive and wanted to fight for smallest reason.everything irritated him-slightly open window, noise i made when sleeping etc.
then he was interested in computers/electronic,had 1,2 friends who were interested in same thing. everybdy was thinking he should study computing, got recomended by teachers to good school, but they realised he was dumb and in first year got kicked out of college.
he found girlfriends( he was attractive because of exotic darker looks and made money )cheated on them,and they cheated on him,he was not interested in computers/electronic anymore, just got job selling this stuff. besides his gf's he didnt have really any interest in anything just to make money.he couldnt speak about anything, just him him and bussines.but he was clever and at 25 he started to build nice house, got nice car.
i lived with grandmums flat and he once had incident fith me , started to be agressive, he took knife of kitchen and threatened me and beated me.(if it was today i'd go to police)
then another fight over grandmums's flat- we had to decide together what to do with that, how to sell it etc and when i just said my opinion he stood up, and with his wrist threatened me to my face. my mum didnt said anything.my parrents, grandmum like him more than me,because he makes lot of money and giving them money.parrents are pround of him and they are silent scared to tell him something and esspecialy my mum likes money so she supported his selfish behaviour(she has mental issue herself.
so because hes surrounded by parrents, grandmum,his GF and other people who use him mainly for money his behaviour is supported.nobody tells him something, he has the power, they are weak or just care about money.
once he told me he has beisball stuck in his car in case some driver piss him of, once he got glasses broken during fight,and i remer time he freakened me out when we drove to somewhere and was driving realy fast on main road, and wanted to make me scared, he enjoyed it.
he got married last year with some quite nice,intelligent,educated,talented girl from village and from poor family background.its not important but i just couldnt get how come she can stay with him the way he is-agressive self centered arrogant but maybe he is not like that next to her, she is just blindly in love. i have the feelings he would treat his children once the same as treated me.to be honest i dont wish him any success,he needs big lesson in life and realise life is more than chasing money from people,we are very different, he has different (unknown biological father), i cant stand agressive people and will not tolerate it,untill he realise it and will try to do something about it but its unlikely to happen so if he'll not get big life lesson thers no way i will talk to him again.and i think he doesnt care about me either.during last christmas i've been in my country he should be happy i am home and instead of it he was furious because i bought better gifts to them than him. like it would matter? its sad, but my parrents, brother are mentally sick people hating everyone with morality,intelligence,real happiness in life.and it was far from heaven to grow up with them believe me. parents never supported me in anything, i heard i have no talent, i am stupid,i been humiliated and degraded by mother, and father showed me he liked my brother more,and now they are interested in me so they could blabling how proud they are of me and of course will want money.i changed a lot since i didnt spoke to them (4 years)and dont know if i will ever want to visit them again,as i will get to my country for couple days on february.i honestly dont know.if there will be my brother it could end up badly as i dont take any shit.