This guide offers tips for writing acknowledgement letters to families for donations made in memory of a loved one. Pay tribute to a loved one with a gift in honor or in memory of them while helping others in need.What do you need to include in your donation acknowledgment letter? Get your guide to writing donation thankyou letters supporters will remember and more thoughtful ideas to show appreciation. Remember to include gift details, such as gift date and gift amount, in your acknowledgment letter to the donor. 3. 1. Personalize the message. Just like any well-written donor thank you letter, your memorial donation gratitude notes should be personalized to each donor. This guide will cover everything from nonprofit memorial donation thank you letters to keeping track of memorial donations and how to notify families.