If your parents shared ownership of their house as “joint tenants with right of survivorship” and your mother survived your father, then your mother gained full title to the house when he died. When she dies, title to the house would pass to the heirs through her estate.

However, not all couples choose to hold the family home as “joint tenants with right of survivorship.”  You or an attorney should check the deed to the house through the courthouse records to learn exactly who the owners are, what is the nature of their ownership, and whether there are mortgages or liens against the house.