proof

"Old MacDonald had a farm, e-i-ee-ii-oohhhhh," we warbled as my granddaughters and I skimmed along the highway towards home.
"And on his farm he had a..."
I waited expectantly.
"Alligator!" cried my tiny granddaughter.
Alligator?! Must be a farm in Florida.
"With a..."
The girls happily supplied the sound effects in unison. It was a wonderful hissing growl. Just the sort an alligator would make.
As I drove along listening to my two, dainty darling granddaughters hissing and growling in the back seat it occurred to me that if ever proof was needed of a big brother, I was listening to it.