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What's your litter box situation like? How many do you have? Will the ones who are related to each other use the same box? My cats are brothers and sisters, born in this house and they all share 1 box no problems.

4 different families 2 boxes off kitchen in 1/2 bath they use the most.. One on porch ..5 in basement ..Some cats won't go down the basement.. One of my hobbies scooping litter.. ha ha.. As long as you keep them clean no problem..