AVR, AMP and Processor.....

My sons new home has cabling and speakers for whole house music. I also gave him my Vandersteen 2CE SIGS for his man cave. Looking for a simple solution to tie in whole house, Vandy’s, and at least 5.1 where Vandys are fronts. He will want Sonos type of convenience. At my house, I have a Yamaha with Musiccast tied to my in walls and this suffices for music house wide. I don’t do home theater. Anyone have a system that can be controlled from an app and do HT? Thank you in advance. Budget is $1K and used is fine.