You were very young when your parents died, leaving you and Bruce orphans. Therefore, Alfred had been the only father figure you had, and that didn't change as the years went by, you know he would always treat you like the kid who used the stair rail as a slide.

"You have an above average temperature, it's best if you don't go out on patrol today." Alfred suggests to you, but you know it's more of an order than a suggestion.