How can we lead our loved ones to improve their bad habits?
You may have concerns about your loved persons' bad habits which is hard to fix.
If you trully want them to improve them, why don't you see them at a different angle and think in a different way? It may help you to get a good idea.
There is a word "houben [方便]" in Buddhism.
You may know a saying in Japanese that "Wuso mo houben. [嘘も方便]” which means that If you want to use houben to lead someone to better direction, you can use lying depends on the situation.
"Houben [方便]" means "the flexible ways with situations to lead someone to the truth".
In this video, Osho Taigu shows you how to use "houben [方便]" in a real situation so you will better understand.