We are hopefully picking our 2 new kittens up next week, when they will be about 9 wks old. I'm a little confused with how we settle them into the house. We have been told to keep them in one room and gradually let them into the rest of the house, our problem is our house is fairly open plan and don't tend to have doors shut very often and when we do our toddler gets a bit stressed (she's used to being able to get all the way round downstairs!). How much space do they need?