Just came across this saying for the first time here:
Another mom countered that parents shouldn't have to take on their child's happiness... that we're all responsible for our own happiness:
http://www.beamarshall.com/blog/youre-only-as-happy-as-your-unhappiest-child/
I dunno though. Maybe it's because my kids are still pretty young, but the saying rings true to me. You?