Most users should use Affidavit of Domicile (MPC 485). If you need to save a partially filled-out form, you may choose to use the alternative form:.1. Fill out the forms 2. How Do I Fill Out an Affidavit of Domicile? An affidavit of domicile is a legal document that certifies the residence of a deceased person. I am my Mom's Executor, and on the affidavit of domicile it asks for her domicile at time of death AND the domicile. Name of Deceased had permanent legal residence at. An affidavit of domicile is a legal document that verifies the primary place of residency of someone after their death.