[Zanders' mom]

This may sound CrAzYyyy... when I brought home a companion for my kitty, ooooh my gosh, she let us know she didn't need No stinkin companion, the hissing, & so on - OOOhhh boy! One day I took my older cat with me to the bedroom and I told her, will you just give her a chance? she is just a baby and I brought her home so you could have a pal. We got back to the living room and she actually let the little kitty come to her without the hiss fit. They were pals from then on. Told you it was nutty.

Pretend like nothing is wrong and treat them as if they did get along, that may work, walk them together, bathe them together, put them on your lap together and so on, Hope they come around in no time .