Bills bills bills

Not sure where to post this.. but when I was living under my grandmas roof she used my name and social for some bills well she stayed owing them & now that my boyfriend and I are getting a place if I wanted to put the bills under my name do I have to pay the remaining balance or what do I do?

I wasn’t aware she used my name. We have the same name when bills came in the mail didn’t think nothing of it. Plus she doesnt have the money to give me for bills 😒 kinda pissed.