Tips on rehoming a cat

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We are unfortunately having to rehome my 6 year old kitty. He’ll be going to live with my sister. It was a hard decision but for my daughter’s safety we have to do it (it’s a long story).

Looking for tips for easing the transition. My sister does not have any other pets at home which I think will help. We’re sending the cat’s litter box, bowl, cat tree, and favorite toys. Is there anything else we should send or tips to keep in mind?