I usually tell parents the highlight of their child day while they are getting dress for outdoor or putting shoes on, if I have the time. I will only talk about something negative if I think I cannot handle the situation myself or my life will get more difficult. When a dcg bit my son a couple of months ago I did not tell the parents since I handled it myself and it never happen again. Something like a kid destroying my furniture (as was mentioned in a recent threat of that kid damaging a couch) I will talk to the parents to address the behavior. Even if they pay for the damage it would be a hassle for me every time I have to take my time to replace o reupholster the couch if the kid keeps destroying it or anything else in the house.