Do Other Kids Really Do Things Like This?

Let me set the stage:
- There is a social worker in our home, because we were having a teen to live with us for a week or two.  The social worker talking about future situations.  I told the kids to stay in their room and clean.
Daddy:  Hey guys, make sure you stay in your room and clean up.
Kids: Ok
 - Literally, one minute later I hear them arguing
Daddy: Hey guys, you need to be quiet and clean up.
Kids: OK
 - Literally, 30 seconds later I hear them Laughing and yelling hysterically
Daddy: Hey really need you guys to stay quiet.
Kids: OK
 - So I come back out to the living room and talk with the social worker for a few more minutes.  When my daughter comes out laughing up a storm.  And says the following - in front of the social worker:
Daughter (Laughing, yells out): BUBBY IS PULLING DOWN MY PANTS! HA HA HA!
 - I'm speechless...(FYI, he wasn't really doing it we found out later.)