Stellitsa mou, sorry about your mom. I know how it feel to be alone when something like that happens... Does your mom live close to you?
I believe WAS, need time when something like that happens to get over their guilt first before they can reach out to help. And since your mom's condition is diagnosed but from what you say NOT yet really bad, he may think he has time to help out and he intends to do it. Love always K
