This makes me feel bad for Chris. I mean yeah, she's made some mistakes in her life but I can respect the fact that she's trying to be his true and honest self.
She knows that Barb is dying just like Bob did and she's not sure how to process it. She literally can't imagine a world without Barbara just like she couldn't imagine a world without Bob. He knows the clock is ticking but accepting reality is too hard, so he rejects it. His mother has given him nothing, instead she's leached off his father's social security. She owns nothing and he will inherit nothing. Her home belongs to the bank and once his mother dies she'll be left with nothing. 14 Branchland Court belongs to the government, not Chris. When Barb dies Chris will be on the streets, and he won't survive outside of a group home setting.
Some might think this is perfectly justified and they may be right, but some might think he's a developmentally disabled adult who deserves better than what his guardians provided him. Both might have some truth to them.