I don't want to go near my nephew who lives nearby and frequents our place because he has tb
Is he getting treatment for the tuberculosis?
He has thrown away his chance for treatment due to financial issues.
I can understand why you wouldn't want to go near your nephew that has tuberculosis, as it's a contagious disease. Staying away from someone that can make you sick is a reasonable and intelligent thing to do.
I feel bad for him but can't risk my health.
I understand.  It's a pretty bad situation all around.  It's good that you're protecting yourself though!