Some of his behavior is absolutely illegal and I would never recommend anyone follow his lead, but it's worked for him.

However, as this was a new tenant and the behavior is not acceptable I knew that I needed them to hear my voice and be put on the spot.

Be courteous and helpful but explain you will not tolerate late rent or bad behavior and you will be golden.

Overall, if you've found a good tenant, keep them as long as you're able to, and no need to worry about a sudden switch in behavior! 

But we all know the best indicator of future behavior is past behavior.      

This is like allowing your dog to eat off the table at dinner it teaches the dog that it’s okay to do bad behaviors in the future .

APPLY THEIR VARIOUS BEHAVIORS,  WORK ETHIC, ETC TO YOUR OWN LIFE.

I didn't know what they were, but looked them up and found out that they come filled with nitrous oxide and are called "whippits" which you can inhale to get high (and just a bit of brain damage, which now makes total sense given his behavior). 

Yes, the involvement of your daughter is disturbing and totally not OK, I would tell the Mother (owner) that this behavior is unacceptable and if she is not sympathetic then don't worry about burning that bridge, it wasn't worth crossing.

Include a copy of the termination letter with your response forms to indicate your “no tolerance “policy for this type of behavior.