What's the Name of That Book??? discussion

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SOLVED: Children's/YA
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SOLVED. YA?/ Sci-fi. Family of possible aliens with blue skin hiding their identity, grandad gets sent to a senior living facility where they actually poison people for population control? [s]
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One of the older family members turns old enough to be moved to a senior living retreat center (all the elderly in the society are forced to go) but the other family members have doubts and go to break the grandparent out of the facility, because they think that the elderly are just killed there (which I think turns out to be true).
I remember a bit about Elvis impersonators, members of the family hiding in bushes to avoid authorities, and at one point there is a gathering on a back porch after curfew hours where people play music? Read this a while ago, so details are very fuzzy.