How many keys do you have??

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Hello friend ,well I would like toask you people that how many keys of the main door of your house do you have, and how many memebers of the family are given individual keys?? Also what do you do if one of the key is lost by anyone of you?? At my house ,we are 3 people, my parents and me, so we have 4 sets of keys of the two doors. And everyone has a set and left 1 set is given t our neighbour. Also in case any one key is lost ,then my father changes all the locks and new keys are given to all. So what's the scenario in your house?? Can you share that with me??