Teenagers and young adults are trying to grow up. Like David using a sling to kill Goliath, centrifugal force is launching them into independence. But sometimes parents activate centripetal force that says, "Go to college but not far away." "Become responsible, but still need me." Which is it? This happens in blended families when the kids are launching, but the new family is blending. Two opposing forces. The answer? For both parents and teens it's somewhere between holding on and letting go.