Have you even tried searching your problem..?
https://www.spotify.com/us/family/
https://community.spotify.com/t5/Accounts/Family-Premium-mul...
https://www.spotify.com/us/family/
https://community.spotify.com/t5/Accounts/Family-Premium-mul...
She's got her own account on our family plan, but she's not going to change the username/password to hers every time she uses the Sonos (and me do the reverse).
I suppose I could generate a "dummy" family member account used just for the Sonos, but then it wouldn't have my playlists....
https://en.community.sonos.com/controllers-software-228995/m...
They really do need to set the stream limit for the whole family plan rather than 1 per account, but at least as a workaround: Can't you share playlists?