My dear, I can imagine this must be hard for you. Your father clearly loves you and your mother. He has chosen you above his own family. Yes he goes and visits them, as a good son would do. But it his family that made life difficult for him, your mother and you and your sister. Dont be angry with your parents, not be angry with his parents. Anger wont help. They are ignorant. Unfortunately one can not do much about ignorance, except for education. I do not recommend you go off on your own to Jordan. This will only put oil on the fire and blame your mother for not educating you. What I recommend you do is talk to your father and tell him that you want to know your roots, ask him to show you Jordan. Dont ask to visit his family, this might only make matters worse. Leave things in Allah's hand. If Allah wants you to meet, you will. Just appreciate the love your father has for you and your mothers love for living with these restrictions.
Aisha-Taweela