Inheritance is not an exception. Quick Bing search shows that "68% of millennials expect an inheritance". So that might be the reason behind their behavior that you are not aware of.
If 68% of the millennials expect an inheritance, how much do they expect to get? Are they making their financial decision based on getting mom and dad's house? Have they considered that this house might be used to pay for mom's and dad's care in their last years? Did they think about the fact that they might get the money only once they at 40 or 50 year's old? What if they end up with $2300 and a dinnerware set after a lifetime of poor financial decisions--I imagine most inheritances are not 7 figure affairs.
I'm worried if this is truly the case.