The affidavit should be sworn to before a Notary Public or Commissioner of Deeds. Required if the decedent (the person who died) has only one distributee (heir) or if the distributees are grandparents, aunts-uncles, or cousins.Under certain circumstances, a family tree affidavit is required for legal proceedings, particularly regarding estate administration. Affidavit (DOH-4092). NOTE: Fill out both Mother's Affidavit and. This article provides a comprehensive sample of an affidavit letter, guiding readers through the essential components and format. In the case of each other person under a disability, state (a) name, relationship to decedent, and residence address,.