"After a handful of clicks, we walked over to the screen and he pointed, saying 'That's the one.'"
As Daniels fished out his wallet, explaining the pictures were a gift for his wife, Santa and his crew told him the pictures would be their gift to him.
Sigmon said Daniel's "grabbed my hand and pulled me in and hugged me".
Of his post, which has been shared over 54, 000 times, Sigmon wrote:
"I'm sharing this to remind us all that Christmastime is unbelievably hard for some families,
"Pray for the brokenhearted. Smile at people. Just be kind. Love one another."
Daniel wrote that he and his wife, Sasha, were "amazed" by the response to the photo and their story and put forward a request for the people touched by it.
"All we want is for you all to do something nice like Caleb did for us," he posted on the Facebook page Hayden Daniel's Hope, created by the couple for their son.
"Just be there for a random stranger this holiday. You don't have to do something big.