How to deal with the relatioship with your old family ?

My parents is kind of greedy. We have afforded the living fee of my younger brother during his colledge (five years)and provided a big money to help him to find a job because he failed in the English exam and not qualified in most of the job (It's strange almost all the good job setting some stardard in English level even though that job will never need using English in our country). Because my parents can only afford the tuition for my brother to go to colledge, so we are willing to help them. At that time, We were just students and we tried hard to save money to help them. My husband worked really hard to get extra income besides the living fee provided for us students by our institute. We graduated at the same year with my brother. One year later, my parents forced us to give out a big money to help them buy a apartment for my brother, or he may has some trouble to get a wife. It includes all my income in one year and also part income from my husband. We were not happy because we thought my brother should make his own money if he wanted better life. But my parents think we are rich than them and allways indict we should buy staff for my brother, like computer, motorcycle. It is true we have much higher salary than them, but we still can not afford our own apartment. It seems my parents just think we are money tree or bank for them. Sometimes I just feel panic.