Parents who act like a super nanny have an amazing ability to take a child's negative behavior and tunr it into something positive.  Here's a suggestion for dealing with children who love to mind everyone else's business and tatle on them:

Tell your child in the mornng you're puttigng him or her in charge of counting the number of times, people in the family smile, burp, say thinak you, etc.  At the end of the day, the child will report to you that one behavior.  If the child. comes to you about soemthing else, calmly remind him or her they are only in charge of the behavior chosen for that day.  Anything else doesn't count.

Try it and see what happens.  I'm sure you'll feel more confident as a super nanny parent.