My sibling has been living rent free in the deceased parent’s house. Does he or she have to pay rent?

Yes, and whoever is the executor or personal representative of the estate can be liable as well for failing to probate the estate (and thus change title to the house, collect rent, and/or sell the property). Usually, the person living in the house is a beneficiary of the estate, and the rent unpaid after death can be charged against his or her inheritance. If the estate is small, or they are not a beneficiary of the estate, the unpaid rent will have to be collected from them, which may be difficult to do.

If the sibling refuses to move, the usual eviction proceedings can be used to remove them from the house so it can be handled in the probate case.