My old roommates had a dog. It wasn't my dog, but I liked it fine enough. I didn't feed it, clean after it, let it out, or walk it. They took care of it just fine, and it was happy. We lived in a modest sized house, and it didn't get in my way.
It is completely fine to have an animal around the house that isn't yours. As long as it's being taken care of properly by at least one person (or in Sliver's case, 1-3 depending on the age of his kids) and obviously not being abused, then it's fine.
Some of you are acting like Sliver is living alone while intending to be abusive to this cat. He has has already said that it's not going to be his responsibility. That'll be left up to his wife. I can't speak for him, but I'd guess that if the cat curled up next to him on the couch, he's not going to go ahead and punch it in the face. It is entirely possible, and ethical to be living in the same house as a pet that's being taken care of by somebody else.
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