
Quoting
Mr. Knowitall
A living will has absolutely nothing to do with inheritance rights, or who would get to live in mom's home after she passes away.
If your mother wishes to draft and execute a last will and testament, given that you don't know the difference between that and a living will, and given the obvious conflict of interest with you being an heir, it would be much more sensible to help her consult a lawyer and have the lawyer draft and assist with the execution of the will than to try to have her draft it herself.
If your mother dies with no will, the laws of intestate succession will apply.
If mom is mentally competent, she gets to pick who lives in her house. If not, it's too late for her to draft a will - you have to be mentally competent to execute a will.