You don't need to tell my dad ~

In the morning , a guard sees a boy climbing a tree.
He says to the boy : " Come-down now ! "
"No. I like sitting on this tree. " - The boy replies.
"I will tell your dad about this !!! " - The guard gets angry.
That boy laughs and says : " You don't need to tell my dad because he's also sitting on the tree over there."