Three ways that a teen can support a family member in need?

1: This depends on the age, but if you are old enough get a summer job, or a job that is part time and will understand you have school.

2: You can try to make a  GoFundMe and random people will go around looking for people in need and donate.

3: If you are not talking about money, then if they are stressed or anything try to help them calm down, get the water and let them rest!

Explanation:

Help them update their resume, help with some financeal problems talk to them