Hi @ravitri 

I don’t see anything wrong with your suggestion. If you purchased Sonance In-Ceiling speakers, you could run all 3 pairs off one Sonos Amp, but you would not have individual control over them. If you wanted that, you have to add a second, and possibly third, Amp. 

Is the family room going to have home theatre in it? If so, you might want to plan that out before placing speakers in the ceiling.

Thanks, not planning a home theatre here.  might just add a soundbar/woofer to the TV, since there will be a dedicated media room for home theatre.