Affidavit of Due Diligence
Proof that you made a genuine effort to locate and notify all interested parties. Required when you can't find certain heirs or beneficiaries.
The court needs to see you made a genuine effort.
If you can't locate an heir, you'll need to document exactly what you did to try to find them — searches, letters, phone calls. A vague effort won't satisfy the court.
When do you need this form?
You can't find one or more heirs and need to show the court you tried.
This site provides general information, not legal advice. For legal counsel, consult a licensed attorney. Official forms are maintained by New York State and may change.
Not sure how to fill out this form?
Our team walks families through the entire process — from paperwork to filing with the court.
(516) 703-6942Other administration forms
Petition for Letters of Administration
Someone died without a will. Before you can access their accounts or sell their property, you need to be officially appointed. This form starts that process.
PALAPetition for Ancillary Letters of Administration
When someone who lived outside New York died without a will but owned property here, this form asks the court to appoint an administrator for the NY property.
ADM-DBNPetition for Letters of Administration d.b.n.
When the original administrator dies or can no longer serve, this form asks the court to appoint a replacement to finish settling the estate.
A-2Affidavit of Heirship
A sworn statement listing all the deceased person's legal heirs — their names, addresses, ages, and relationship to the deceased. Required in every administration proceeding.
Inherited a House in Nassau County?
Selling inherited property involves court filings, tax clearances, and title issues that most agents don't understand. Keystone Pinnacle specializes in exactly this.
Get a free consultation — we'll walk you through the process, the timeline, and what documents you need.
Not legal advice — estate property advisory and court filing guidance.