The L. Frank Baum Family Trust is, as its title indicates, the trust established to manage the legal and commercial rights to the Oz works of L. Frank Baum for the benefit of his heirs. Baum's immediate heirs, his widow Maud Gage Baum and his four sons, received a share of the royalties from the series of Oz books that continued after Baum's death. They and subsequent family members acted to preserve and defend the legacy of Baum and Oz as they saw it, and set up the Trust to that end. The trust was managed by Baum's grandson Dr. Robert A. Baum (1915–1988) until his death.