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A family contact plan, written down
The agreement that turns a scattered household back into one during an emergency: who calls whom, in what order, and where everyone meets. The plan names an out-of-area contact, because long-distance lines often work when local networks jam, and a relative two states away becomes the switchboard. It names two meeting places, one near the house and one outside the neighborhood, so an evacuation has a destination instead of a debate. Texts go through when calls cannot, so the plan's standing rule is simple: text first, keep it short, and wait.