I just think they go overboard in "protecting" sane adults capable of buying a home but evidently, not capable of selling it on their own ...

There's a 2 bedroom apartment, and 2 adults + 2 small kids move in.

Some of them are responsible adults and will do everything to the letter of the agreement, and some of them will behave like children and test, challenge, and play you every step of the way.Some of what I say next depends on your market and your tolerance for shenanigans.

For the first time in my adult life I finally consider myself "comfortable", and I immediately began looking for the next thing to put my focus into. 

I have a good renter of 4 mouths and today she told me her 15 yr old sister was moving in the the apartment with her. Is there anything special I would need to do here to cover my butt?

, but something I've found true my entire adult life is that you don't have to know everything, just know the next step and who needs to be involved in that step (or some variation on that paraphrase).

My wife has worked as an administrative assistant for much of her adult life, and I’ve been working (for over 20 years) in ophthalmology (Retina specialty), as a technician and biomedical photographer.

If they need adult daycare need more into apartment.

was it the judge or the tenant that had consumed the excessive amount of adult beverages?

I look for vinyl plank floor or tile floors, easy to clean one piece tub/shower surrounds, and a bed/bathroom arrangement that appeals to single adults or couples.