This guide offers tips for writing acknowledgement letters to families for donations made in memory of a loved one. What do you need to include in your donation acknowledgment letter?Acknowledge this gift to: A letter will be mailed to the individual or family for donations given in memory, honor, or thanksgiving (include name and address). Take a look at what makes a good thank you letter for a donation or use one of our provided templates to help get you started. We will also send a card acknowledging your gift to a person of your choice. Open our Memorial acknowledgement Donation Forms and search for the form you require. Remember to include gift details, such as gift date and gift amount, in your acknowledgment letter to the donor. 3.