Overwatch w/headphones & speakers??

Hi all,

 I figure if anyone would know it would be you guys. Is there anyway to play the game sound through my speakers as well as my headphones. I want to use my headphones to communicate with my team, but I'd like the sound to play over the speakers (as well) so that my son can follow along.
 Is this possible, or am I forced between headset or speaker?

Thanks