My nicest, most supportive parent is also the most lackadaisical about my rules and regs.
The parent who says "Of COURSE you need to take time off to heal that back." The parent who then phones you over the weekend to say, "If you need to take more, don't worry about it - I have lots of sick days saved up that I can use." The parent who is respectful of your expertise and asks your input on parenting issues - and then implements it!
This same parent is the parent most often late to pick up, most likely to send a sick child, and the one who forgets to pay the late fees.