Is it okay to forgive your rapist?

This is to extent my question, and give it a bit more detail.

See, I was raped by 3 of my maternal brothers, Brent, Jordan, and Brandon, and I finally only forgave Brent for one small detail. Brent is the father of my twin's, Kendra, and Dani. I was wondering if it was okay to forgive him and not the others. Without him my 15 year old daughters wouldn't be living right now, and they are my life. I was wondering if I can forgive only because he is the father.

It seems kinda wrong, I know, but this has to be answered.