Glad to see some sanity has returned to this thread!
When it comes to teens, a few things are worth remembering (learned these over several years as a teacher):
High expectations: This was always the first teaching standard and took me years to understand. It means believing that the pupil (works equally well as a parent) can do well AND enforcing that expectation with appropriate sanctions.
Praise, praise, praise (but not vacuous praise): Everyone responds well to praise, but teens see through meaningless praise in a second. Sometimes you have to look hard for something to praise, but it will happen eventually, and then you can create a virtuous circle.
Clear and firm instructions: I was taught never to say please but always to thank. I ended up ignoring the not saying please but a lot, but it can be effective if you are being ignored and ‘please’ can be seen as weakness.
Don’t just tell but explain and show, and break tasks down:I learned this the hard way by telling a class to ‘tidy up after a science practical’. Mess, smashed test tubes, filthy and blocked sinks etc etc. Now I always break things down into step by step instructions and demo it first. Same for my own teens when I tell them to tidy their rooms. I explain step by step how to do it and help them (they are younger teens). Eventually ‘tidy your room’ will work, but only after they know how to do it and understand the expectation and why it is a good thing to do.
Lead by example: This clearly applies to any leadership. No good to tell a teen to tidy a room if your own is filthy!
The idea that letting a teen be a total slob and bringing them a hot chocolate is good parenting couldn’t be further from the truth. A good parent is not a mate.