Animal Care Needed - Now Hiring

recently moved with my 2 cats. they're sisters I rescued as kittens. moved in with wife who has 1 cat. one of my cats is okay with hers, but my other cat is aggressive towards the others. can also be aggressive towards wife and I when exposed to other cats. have kept separated for 3 weeks, but the aggression returns as soon as other cats are seen. even her sister who she was extremely friendly with before the move