Android TV for households

So, how does it work for households, with more than one person living there? which account is used? How does it handle recommendations? This is something I haven't seen anyone figure out well. Let say if I have the main account used for the TV, but my wife bought a movie from the play store, is there a way to merge accounts so the content is easily available on the TV? And no, casting it from my wife's device is not good enough ;-)

What about children, will there be parental controls or other ways to prevent kids watching content not appropriate for them? Not just preventing purchases, since I assume if I've bought an R-rated movie from the play store, it'll be immediately available on the TV for them to click play. And Android TV recommendations will be useless after a summer of my kids watching TV :-)

I know, lots of questions. Has anyone seen details of this sort?