Grief - mine vs theirs

It was suggested to me that I talk with my stepkids about our grief. That they would then understand what I am going through and know that we have a shared grief. HA! I have attempted many times to have this type of discusson with them. They always tell me that they do not want to talk about it. All they want to talk about with me is the estate and money money money.  They DO grieve for their father. I know that. But they do not CARE about ME. MY grief is not as valid as their grief.  This is a point many people are just not getting.