I know that feeling ... Perhaps there was people you really cared about who disappointed you and over time your feelings started to wore off ... It's not good 'cause at the beginning all that anger...

It's actually very normal to be angry towards a sibling ... You perhaps only need to talk about that so you can both understand that you're family and need to get along together

Actually the question wasn't focused towards whether or not we blame our parents for our adult life, 'cause you're right we all are responsible for what we choose to do and how to overcame that ......

Perhaps the hardest thing i have to do now is to forgive them hoping i'll understand why they did what they did ...

That's kinda true ... but don't you think it's sort of ironic? ...