Reverse mortgage benefits

I have an issue that needs clarification. My sister in law seem to think
that money is due her and my husband. Their father got a reverse
mortgage on his home for 92K. He passed away April 2014.
She believes that at the time of his death, the property was assessed
at 130K and that the difference between the mortgage and
assessment is to be allotted to them. My husband and I both agree
that this is not correct. Are we right?