Two things:

1 - Why did Kate refer to Abby as her SISTER IN LAW when talking to Chad today?  HUH!  If anything wouldn't Abby be her daughter in law via her marriage to Stefano and a step mom to Chad?  

2 - Why does everyone knock on doors and not just leave after a min or two?  Eli did it to Ben twice - Chad just did it to Kate.  Just don't answer and they'll go away LOL