u/Frost_Demise

So I have had a gray cat named smoke for about 3 years now she used to have a brother but due to a very long story I no longer have him anymore and recently moved into a new apartment and adopted a 8 week old kitten from a friend any advice on getting my 3 year old cat used to the kitten? If I touch the kitten and then try to pet her in the other room afterwards she instantly starts hissing any advice helps. Thank you!!