Giggles
Children laughing...
Squeals of delight...
6 pairs of feet thundering thru the house...
"I'm stuffed!"
"I hope Santa remembers what I asked for..."
"I love you, Nama and Papa....Grandma and Grandpa"
Christmas carols being sung by a choir...
etc, etc, etc.
As you might imagine, these are the sounds of children at Christmas!!