My parents are going through a divorce and my mother does not make much money, is it possible to have her keep her number and just start a line on my account with her old number?
Yes, this is possible. You will need to go to a corporate store with your mother or you can initiate the process online. You will need the account owner of your mom's line permission. (easy if she is on the account, tougher if it is her soon to be ex).
I am sure it is a tough time, and we want to help make things easier in any way that we can. To answer your question, yes your mother should be able to keep her number and transfer it to your account. You can find details on how to start the process, here: https://www.verizon.com/support/transfer-service/overview/ Does this help?