No context given, how do you expect reasonable answers? Just some things that would majorly influence what the appropriate actions would be: 1) Does the 18 y/

No context given, how do you expect reasonable answers? Just some things that would majorly influence what the appropriate actions would be: 1) Does the 18 y/o (an adult, by the way!) have a job already, and this is how they spend their free time? 2) Have the family tried the revolutionary tactic of talking to each other about their concerns? 2a) If so, what were the results of the conversations? 3) Is there other influencing factors (e.g. social anxiety, other underlying medical conditions, etc.) that aren't being addressed? 4) Did the behavior start recently? If so, what triggered the change? If not, why is it suddenly a problem? 5) What is the end goal? Have them move out? Have them be more physically fit? Contribute more to the household? Edit: Reading through some of these comments is disheartening. It sounds like a bunch of managers figuring out the best ways to discipline an employee rather than parents trying to foster healthy relationships with their kids and encourage healthy lifestyles. Being a parent requires effort, not just stripping your kids of every luxury or slightly positive aspect of their life until they become the model robot/employee.