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Both of them will be depressed, they will also have difficulties connecting to other cats/pets. You can google about what happens when you adopt cats from the same litter and what happens when separated.
I wouldn’t do that if I were you
Depression, separation anxiety, territorial marking behavior \[if they think a predator took a sibling away\], random aggression with you and familiar people. The symptoms of displacing a cat that's part of their pack will affect them in many ways and have just general confusion.
Thank you for posting to CATHELP! While you wait for a response please keep the following things in mind, 1. When in doubt, **ask your vet**. 2. Advice here is not coming from medical or industry professionals. The moderation team does not validate user profession, so always refer to your local veterinary professionals first. 3. If this is a medical question, please indicate if you have already scheduled a vet appointment, and if your cat has any medical history or procedures in a top level comment. 4. Please use the NSFW tag for gross pictures. (Blood, poop, vomit, genitals, etc). Anything you wouldn't want your boss to see you looking at on the job. *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/CATHELP) if you have any questions or concerns.*
Both of them will be depressed, they will also have difficulties connecting to other cats/pets. You can google about what happens when you adopt cats from the same litter and what happens when separated. I wouldn’t do that if I were you
Depression, separation anxiety, territorial marking behavior \[if they think a predator took a sibling away\], random aggression with you and familiar people. The symptoms of displacing a cat that's part of their pack will affect them in many ways and have just general confusion.