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To put it short, the 2 young males are siblings and the man with "grey hair" is their father. The girls are sisters-in-law. The elder sister-in-law (in black lingerie) told the unknowingly younger sister-in-law (in white lingerie) about the brothers' family has a "special union tradition" to celebrate the mooncake festival (notice mooncakes served on table), which apparently turns out to be family orgy.
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