I have 2 kittens they are sister. I went and picked up Raider last week, to the day, and she has been doing really good. Today I went and picked up her sister because the family that had them needed to find them good homes. As soon as I brought Oakland, my new kitty, into the room Raider started to hiss. My friend who was here told me that this was normal since Raider has been in the apartment all by herself and she is going to have to get use to the other kitten. Well I let Oakland start roaming the apartment so she can feel comfortable. I picked her up so that I would be able to take her to the litter box and to her food. While I was holding her she started to hiss and scratch at me. I thought maybe this was due to her not knowing me and scared of being in a new home. I then let her wonder by herself and all she did was hide under the bed. It was time for bed now and me and Raider got into our usual bed time pattern of getting comfortable and I could hear Oakland start to cry so I helped her up on the bed so she could lay with us. She was laying for just a few minutes letting me pet her then out of nowhere she started to hiss at me. I stopped petting her and tried to let her smell me and she jumped off the bed and went back into hiding. I keep trying to pet her and let her get use to me but she just keeps hissing. I am really worried. Is this normal and will she start to get more comfortable? Please help!!!