its a hard choice, and spending some time praying about it, and trying to get ahold of those pastors again and discussing the situation with them isn't a bad idea-explore every possibility you can, but realize if you really want those kids safe you need to do something-even if it means getting smacked around. And, if all else fails, call CPS. Giving those kids a chance to grow up in a loving home instead of getting beat may be a hard decision, but its better then getting beat to death because daddy lost it, and it may even knock some sense into dad. CPS has been known to return kids to parents if they get their lives back online.
Now, Im not saying run out and call CPS, I would use that as a last resort, but keep in mind, true love puts all else before your wants and needs-I realize you love your brother, and his kids, but at the same time, he needs to change, and his kids need protection-theyre innocent in all this. If you stand up, and say stop it, and he hits you, at least you had a choice-those kids don't, they don't have an avenue of escape, theyre not asking for that. I would advise reaching out for help-and not just online, dont give up on your pastors. If you can't get them to give you the time of day, find a pastor at another church, or a elder, or something, and get them to help you. You dont have to do this alone.