Acknowledgment cards or thank you cards should be sent for any of act of kindness. Most thank you and acknowledgement cards are sent due to funerals and memorials. It is considered good etiquette to send a thank you or acknowledgement card to someone who during or after the funeral or memorial sends or brings flowers, money, food or any other gift of kindness. Sending out thank you and
. acknowledgement cards can be very healing for the family. If you are going to send out pre-printed cards of thank you and acknowledgement, it is considered good etiquette to add a handwritten note inside.