Oof, poor kitty. And isn’t that just what this trip needed - more uncomfortable tension in the air. Is your brother the type of person to find comfort from talking about a recently-deceased pet? Or will it just make things more awkward?

My brother (and his wife) practically house a menagerie/farm. Not that they care about animals in some particular way, I honestly don’t know why they do anything they do. But I know that for them, life just rolls on.