why is there no money for kids who want to go to school and they have lost a parent to cancer

I'm twenty years old and about two years ago I lost my dad to lung cancer. He had been smoke free for three years and we found out he had cancer. In les then six months he died. By the fourth month he had no idea who his own kids were. My mom was working full time and I had drop out of school to work full time so we could keep him at home. Now I'm trying to go to college and there just dose not seem to be any help. My mom is barely making it herself. She also has gone back to school. I have four younger siblings and I would like to see all of them go to school. But its expensive even with government pell grants. Mine did not even cover all of my tution. I'm a Biology major at Utah Valley State College. All I want to do is get a degree and do research , mainly on cancer. If anyone knows anything please let me know. My email is DaT8d2@aol.com. Thankyou.