<human>: He's a senior in high school and I dorm so I'm not at home most of the time. Basically he's become quite rude and aggressive in his behavior towards my parents. He also does not respect their wishes. They give him everything, car, gas, money etc. He'll be out all night, or disappear for a few days at a time, without telling anyone. He doesn't do anything around the house to help out nor does he have a job. He had a good paying job (under the table) but he quit that so he could have fun (It's fine he's a kid but he takes on no responsibility). He spends important family holidays (Thanksgiving) with his friends rather than us. He bought his friends mom a mother's day present but does nothing for our own mom. He's barely graduating and doesn't care about applying to colleges or his SATs. On top of that he refuses to see what's wrong with his behavior. He doesn't often open up to me but he told me he used to cut because he felt like our parents weren't proud of him and compared him to more successful kids.

I know I'm not his mom but this has really been stressing my parents out and they work day and night to make ends meet. I recognize we're different people and I respect that. What can I do to positively influence him and help see what he's doing wrong and how it affects the people around him?

Can you condense the text into three sentences or less?
<bot>: Younger brother isn't part of the family. Used to cut. Leeches parent's money. How can I fix this?