Should I tell my father?

I have very disfunctional parents and a complicated relationship with them. My father is a difficult man, doesn't talk to me much and is quick to anger, but he can be absolutely wonderful and caring when he is in a good mood. My mother is entitled, manipulative, deceitful and controlling, but also warm and caring and helpful to others. My parents are in deep financial troubles. They lost their house and now my 80 year old widowed grandmother is loosing hers too because of them. I just found out that through the years they have been forcing her to sell her properties and downsizing to get (more than) their share of my father's inheritence from my grandfather. They are renting an expensive house and refuse to live in an apartment, even though it would have saved my old granny from loosing her house. She can't even buy an apartment unless my aunt takes a loan to pay for third of it. I think it is my mother who insists on a specific lifestyle my father simply cannot afford. When he lost his job in the recession she was furious at him. She told me that if they lost everything and had to live in an apartment she might as well divorce him and live in an apartment on her own. She talks **** about him behind his back all the time, to his children, his own mother, her family and friends. He can be difficult to interact with, yes, and he handles money poorly, but everything can't just be his fault. Should I tell him what she has been saying behind his back all these years?