The definition of family member covers a wide range of relationships, including spouse; parents; parents-in-law, children; brothers; sisters; grandparents; grandchildren; step parents; step children; foster parents; foster children; guardianship relationships; same sex and opposite sex domestic partners; and spouses or domestic partners of the aforementioned, as applicable. The list of family members for whom an employee may request donated annual leave under the ELTP may be found at OPM.