Peggy Liede and Delores Ellis are sisters living in Georgia and for the past three decades have kept a tradition between the two of them alive.

Back in 1986, Peggy wrote a note inside of a birthday card and mailed it to her younger sister. The next year, Delores sent the same card back with a new note written.

The sisters, now 87 and 85 years old, have kept up the back-and-forth ever since. With Delores' birthday coming up in about a week, the card has just been sent for the 64th time.