Intrinsic values are things like creativity, social justice and connecting with nature and are said to be internally rewarding. Extrinsic values focus on getting external approvals; wealth, social status, self image and personal security.
have both of them be right next to each other at the same time and ask them what's going on so they can't lie while being right next to each other. If they both don't fess up just make sure they're always seperated.