I had a friend that was abused by her brothers and she didn't have any bad feelings toward them. I believe its because her father did it too, but he was very violent. It is hard to deal with anger when it is your immediate family. Sometimes when talking to others, it seems that when more then one person in someones family abuses an individual, they tend to hate the violent ones, and because they need some type of security, they rely on the others in the family who are less abusive.
When you have very few people in a family to trust, it makes sense to stick close to those less violent and shun the ones that are.
Hope this helps. It basically comes from others I have met with the same problem.