IMPOSSIBLE QUESTION:
When growing up, this is one of the most common things that siblings will argue about; what is it? 

It does not happen in the house 

ANSWER:
When growing up, one of the most common arguments siblings will have will be who gets to ride shotgun or who sits where in a vehicle.       

Congratulations to Miles McCollum of Eaton, OH for being the first to correctly answer the Impossible Question!