Anytime any two people do not get along, you can be pretty sure that both are at fault, for no one is perfect yet. Even saints are imperfect; only God is. It takes two to tango. Following Jesus' advice "Do not judge" will go a long way toward creating peace. That family members do not get along with each other is common. Look for your own fault, admit it, and let go of the other person. For Jesus said, "Blessed are the peacemakers, for they will be called children of God."