Speaker Pairing and adding Living Room to Whole House group

I`ve got the TV connected to a Sonos bar and there are also two Sonos speakers at the back of the room. The Sonos Controller recognized it all as Living Room. The TV appears as a Source in the Sonos Controller. This works okay when I watch TV.

I`ve got other rooms set up as well. I`ve created a group called Whole House which includes all rooms except the Living Room. This works okay when I listen to music.

Question 1 - Recently, one of the rear Living Room speakers has been lost from “Living Room” and has appeared as a new room called “Den”. So when I watch TV, I need to group Living Room with Den so I can hear the TV through both rear speakers. Do I just need to Pair it with the other rear speaker?

Question 2 - When I`m playing music in the Whole House group, I want to hear it in the Living Room as well, so I add the Living Room+Den to the Whole House group. However, this means they don't work when I watch TV, so I then need to remove the Living Room+Den from the Whole House group. Before I could turn off the TV and play music. Or turn off the music and turn on the TV and it would just work. I didn`t need to keep switching the Living Room+Den in and out of the Whole House group.