What is the Successor's legal obligation to an estate after last surviving Grantor dies?

The Successor's legal obligation to an estate after the last surviving Grantor dies is to administer the estate according to the terms outlined in the Grantor's estate planning documents, such as a will or trust. This may involve distributing assets to beneficiaries, settling any outstanding debts or taxes, and fulfilling any other instructions specified by the Grantor. The Successor is required to act in the best interests of the estate and its beneficiaries.