That I am well acquainted with the above-named decedent and make this affidavit regarding the legal domicile of said. Instructions for Completing Affidavit of Domicile.Complete items 33, 34, and 35 only if decedent owned real or tangible personal property having an actual situs in New York State. Verify the home address of a person who has died. An affidavit of domicile is a legal document that certifies the residence of a deceased person. An affidavit of domicile is a legal document used to establish a deceased person's primary residence at the time of their death. 5 Provide the following information regarding the residences of the decedent during the last five years preceding death (submit additional sheets if necessary). 1. Gather the decedent's personal details. This affidavit is made for the purpose of securing the transfer or delivery of property owned at the time of the decedent's death to a purchaser.