Ditto, the generational thing. One of my husband's early problem pupils was the father of a couple of mine. He and a friend actually followed my husband down a side street after DH had retired and offered him 'a square go'. (What? Two middle-aged men against a retiree? Really?)
The day that DH's brown belt in karate was in the sports listings in the local paper was the day that all the hassle from that family stopped. I was teaching the daughter at the time and she asked whether the Mr Weary named in the list was my Mr Weary. (I've told the story of what happened when he got his black belt elsewhere.)
I still see various family members in the local court reports. The funniest one was the young man who was convicted of fencing stolen jewellery after he gave his real name and address to the jeweller who bought the stolen goods.
Re: complaints
I had to take my dad to an important appointment at a hospital at the other end of the county from my school.
The nurse waited for the consultant to pop out and then complained in front of my father about the teacher in charge of her idle son's certificate course. She went on to tell me that she was doing bank work at the hospital to buy her son a lavish Christmas present.
I tried to be as professional as possible, not to discuss school matters in front of Dad and reminded the mother that she could contact me at school.
I then complained to the consultant in private. Sod that. I would put up with a lot, but that was just too much.