Father died in 1993, no will. Step mother died in May 2010. Who is entitled to the house that is still in fathers name and step mother moved out of 5 yrs before she died

It depends on the state law. I've just lost my soothsayer's abilities and I cannot guess which state has jurisdiction.

As noted ANY question of law needs to include your general location because laws vary by location.

A possible scenario is that that the estate went to the step mother as the spouse. Now it goes to the step mother's blood relatives, not the father's.