That I am well acquainted with the above-named decedent and make this affidavit regarding the legal domicile of said. Verify the home address of a person who has died.1. Obtain the Affidavit of Domicile form. How to write an Affidavit of Domicile? How Do I Fill Out an Affidavit of Domicile? An affidavit of domicile is a short legal document that helps to establish a person's place of residence following his or her death. An affidavit of domicile is a legal document that certifies the residence of a deceased person. How to fill out the Affidavit of Domicile Form Instructions and Details? 1. Gather the necessary details about the deceased person. 2.