Nice troll---
Not much info here. What is it you want to do?

There are plans for several rocket-boost RC airplanes. Nothing wrong with them at all.

Firing rockets from you airplane might cost your dad a few thousands of $$ if you cause damage, since that would kick-in an exclusion from AMA insurance. The local AMA club would probably kick you off their field if you launched from an airborn airplane.

If you start a big fire, you could be liable for the put-out cost in most States.