I rescued two kittens from a lady who got them off the street, two brothers they were also captured with mom and dad. The lady runs a rescue centre from her house. They were around 7/8 weeks old when captured, the one boy is fine just has cat flu that wont go away! The other one the bigger brother (same litter and same dad) is the total opposite! We got them at around 12 weeks old and in her care the one seemed to change after the first time we saw him he started hissing a lot and growling she said it would be fine. We ended up getting them at 12 weeks and the bigger brother who hisses wont stop! He hisses everytime you try and go near him or even to walk past him. They are both now 5 months old and he is still the same he will take food from your hand and play with us and watch his brother get stroked and picked up but as soon as we go near him he hisses and runs. PLEASE HELP!!