To greet her dad Willie on Father's Day, "Duck Dynasty" star Sadie Robertson used an adorable throwback photo of her with her brother John Luke sitting on their father's lap on Christmas Day.

Willie is known for his trademark beard, and in the photo, he is seen sporting the beard—but in a different hue since he is dressed up as Santa Claus!

"Happy Father's Day to the man with the beard :) thanks for loving us unconditionally & leading our family up, Sadie wrote on her Instagram account (@legitsadierob). "Thank you for all the food you cook us & basketball tips you give us. We are so thankful for a dad like you. We LOVE you!"

The second person Sadie greeted for Father's Day is her grandfather from mom Korie's side of the family, and she even shared a photo of the two of them in a warm embrace. "Another happy Father's Day post to my 2papa ♥️ thanks for always being there for me. I love you more than we both love food... which is a lot. You rock."

On the other hand, Korie also greeted her dad on her Instagram account (@bosshogswife) by sharing a photo of the two of them holding up a bobble head figurine.

"My dad had a bobble head made of himself and my mom holding a heart that says 'Love' just because❤️ So thankful that's the kind of man he is. Loving God, my mom, his kids, grandkids and others with passion, kindness, strength, gentleness, and humor. Love him!"

People who saw Sadie and Korie's photos have been amazed by how young Korie's own father looks. "Looks so young to be her grandpa!" someone commented on Sadie's photo.

"Wow your mom and dad look great! Seriously about that fountain of youth though," someone commented on Korie's photo.