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The modern family rule where a divorced, single, or unremarried parent isn't allowed to date anyone that isn't at least 15 minutes older than their first natural born child. It's called the "Biscuit Rule" because 15 minutes is also the average time it takes to properly bake a biscuit. The rule exists to prevent the single/divorced parent from embarrassing their kids by ever making them say they're older than a prospective step-parent.
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