I thought we were talking about a fifteen year old here.

If it were me, and it's not _ I'd change the password on the computer asap, and instruct mom not to give it out, period. I'd then point deadbeat ( sounds deadbeat to me, anyway) nephew to the library for his GED.

I've done something similar. We bought my disabled sis in law a laptop. Whenever he kid comes to visit, he likes to gunk it up with all sorts of kid crap downloads. I changed the password, kid doesn't use it, he whines a lot but he'll get over it.