This guide offers tips for writing acknowledgement letters to families for donations made in memory of a loved one. 1155 Santa Clara Avenue, Alameda, CA 94501.Monday through Friday from am – pm. This guide will cover everything from nonprofit memorial donation thank you letters to keeping track of memorial donations and how to notify families. What do you need to include in your donation acknowledgment letter? However, the Library Director, upon direction from the Library Board, will issue a gift receipt acknowledgement form at the donor's request. 1. Personalize the message. Just like any well-written donor thank you letter, your memorial donation gratitude notes should be personalized to each donor.