They squeal and scream with delight when he "gobbles" them or when he runs around the house with them on his shoulders. They are just as happy with a wrestling match or story time. They know they can depend on him to be there for them, to provide for them, to teach them, to love them.
They have no reason to doubt this.
In a world filled with dads who leave or dads who abuse or dads who cherish their resume' more than their family, I know that my boys are blessed with one of the best gifts there is. A real dad.