My mom has been talking about death lately and frankly, she is beginning 2 scare me with what she's been say'n?

Your mum is preparing you for her eventual death. Get her some counseling . She knows what might happen. With all the stress she is under and you say that she is your best friend then help her sort things out. Your son is selfish and either should be made to move or help out his grandmother more and pay board or leave.