The whole point of your cats doing this is to make the new things part of their territory.
Try taking whatever they play with, lie on, sleep on along with bedding that the family have slept in and rub it on to the new stuff as though you have nothing better to do! (Do not let your friends, even good ones, or neighbours see you doing this!) Do not use anything that you can remember being peed on and try to keep the cats out of the room with anything new in for a couple of weeks to let the scents "mature". They should then accept the new object as normal.