All the Kind Strangers (1974)
An LA photographer, driving through backwoods country, spots a young boy walking on the side of the road and offers him a ride home. After reaching the isolated house, he discovers that the boy and his siblings are keeping a woman prisoner as their "mom" and now he is expected to be their "dad"...or else.
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Simply Perfect
It's not great by any means, but it's a pretty good movie that didn't leave me filled with regret for investing time in it.
I think this is a new genre that they're all sort of working their way through it and haven't got all the kinks worked out yet but it's a genre that works for me.
Each character in this movie — down to the smallest one — is an individual rather than a type, prone to spontaneous changes of mood and sometimes amusing outbursts of pettiness or ill humor.