I'm not going to give my sister in law a ride when she claims she doesn't need to have a license or car to drive her and her two year old son around
Why not just give her a ride?
I don't agree with her or her beliefs.
If she's going to drive around with a license anyways, its better to just give her a ride so she avoids any legal issues.
Life is tough. I don't care that she has a kid, she should go get a job if she needs to and buy a car.
It's fair that you want her to be a responsible parent, but she can't accomplish those things all at once. Try giving her some time and help out when you can if you can get her to agree to do some of those things you want her to do.