Orange tabby turned feral

I used to have 6 cats, now I only have 5. The 6th one, Simba, ran away. He is neutered. His mother was semi-feral, if that's possible, but we made sure the kittens were more used to being handled by humans. We go weeks at a time without seeing Simba, but today I saw him outside having a standoff with my other cat, Baby, who is half Maine Coon. Simba was very skinny and actually looked malnourished. He's forgotten his name and he acts like he's just snapped and gone wild. He doesn't seem to remember us. I feel so worried. I can't go near him because he'll most likely just run away. We gave him lots of food and love when he was living with us, so I don't understand what the deal is. He was my favorite of the liter of 3. We still have his brother and sister, Knox and Princess, and they love us to death.

Welcome to TCS!

This thread has been moved to the Stray and Feral forum, where you'll hopefully get some helpful advice. How old is Simba? How long did he live with you? Is there any possibility of borrowing a humane trap to catch him? If you manage to, you might be able to keep him confined indoors until he grows re-accustomed to human contact.

Simba is about 2 years old. He lived with us from birth to about a year and a half.  I'm not sure, I will check into that. Thanks for the suggestion

My sister said that a reason he could be acting like this is due to jealousy. He could have been jealous of his siblings or something. Is this likely?

If you are wanting to bring him back inside you may need to borrow a humane trap.  Since he has been out on his own for 6 months or so, he has had to fend for himself.  He has probably had to fight and/or worry about food.  I do not believe he is jealous of his siblings more likely he is threatened by them.  He now sees them as a threat since he feels they may stand in the way of him getting food. 

Can you start to leave out food for him and keep your other cats away from him.  This will give him peace of mind that he can have a meal without worrying about others trying to take it.  Allow him to eat as food is a great way to win the trust of a cat once again. 

Being out on his own for 6 month has brought on feral like behavior.  It may take him some time to readjust.  If you do bring him back inside, he will need a room of his own to readjust.  I would not just let him back inside like he was before.  He may need to be reintroduced to his siblings.  Even though they were born and raised together, they now are foreign to him.  He will not see or remember them as his siblings.  They now are just other cats. 

If you do catch him and bring him back inside, I would not allow him back out again for quite awhile.  He will need time to readjust.  You can do this outside by providing him with daily food and water.  Yet I would feed him in a place he feels safe and not threatened by the other cats.  Also be sure to only feed during day light.  You do not want to attract other unwanted critters.