Please Advice Me!! Should I Pay My Tithe Or Pay My Brother’s School Fees?

Okay, this is a challenge I need a solution to.
My parents are saying no money no money when it is obvious that they have.
My little brother is home because he has outstanding fees so I was wondering if I should give him my tithe to pay part while I pay the tithe next month when I get my next salary, I don’t know what to do.