Will my father's estate pay the car loan we got together?

by Ashlee
(Michigan City, IN)

My father and I jointly purchased a car. The loan is primarily in his name. He died May 2010. The bills now come to the Estate of my father but I have been paying them for the last 15 months. I was wondering if because my father was primary if I could submit the car loan to his estate to be paid off and recover the monies I have paid for the last 15 months on this loan? I'm not a greedy person but my mother and brother have been stealing from the estate and not sharing it with myself and half sister like they should. It would be a nice way to stick it to them.