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Your planner shows your family where everything is. This is the 15-minute guide that actually sets it up so it works — step-by-step Apple, Google & Facebook “legacy contact” setup, two-factor & phone-recovery, and protecting your photos. The part almost no one knows to do.
A map and a master key — you don't need to copy every password here. If you use a password manager, just point your family to where its master password lives. If you don't, fill in the key accounts by hand.