PK, I am sorry about the experience your brother is having, and maybe he's over medicating a little bit. THC has a tendency to make a person paranoid and if he's gotten to the point where he's a bully to women and kids, maybe he needs to take a break... Anything in excess isn't good for a person. But don't let that negative experience cloud your judgement on the plant as a whole. This is the reason why marijuana was outlawed in the first place.

Big cotton and lumber corporations used fear and propaganda to outlaw the plant so that they could include Hemp(a closely related cousin) and kill the hemp industry. Hemp is such a versatile substance that can greatly benefit mankind as a whole.