My daughter, sons and a neighbour. When I moved into this house, all locks (front and back doors were re-keyed to the SAME key. My GREATEST fear was to be locked out while the neighbour was away and installed a keypad at the back door.
An aside: When one of my sons bought his first house, he had the locks changed to fit the keys to my house.
An aside: When one of my sons bought his first house, he had the locks changed to fit the keys to my house.