Having more speakers may be overkill but it also yields better coverage with less hotspots.
Keep the 4 speakers in the kitchen if you can afford it.
A good rule of thumb for background speaker placement is to divide your room into 3rds, length and width wise. Place the speakers at the intersecting points.
In regards to having your family room a surround room. I have seen rooms with separate speakers for background music and surround systems, it really clutters up the space and makes your ceiling full of holes. You can use the surround system as a background music zone, you just need to have some planning of how you want to control it and how you want to use the rooms and zones.
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