You can call Verizon and say you want to do an "Assumption of Liability" for those lines. Since you don't have a calling plan you'll need to add that, and your mother will need to release the lines to you.
Thank You so much for that information. We are going to call Verizon and try to do the AOL . I hate to say it , but dealing with Verizon customer service has become just like dealing with the IRS , its never a good experience and we never seem to get any where but I'm going to cross my fingers and give it a shot.