Cats are very interesting and diverse as people. Their personalities change quite often throughout their whole lives. I've always had at least one if not more cats and their personalits do change when they get spayed/neutered(thank you), but give them a couple/few weeks to months and they will probably come up with a new relationship. since she was spayed, she's not a moma anymore and he's not a son anymore it's as if they're meeting for the first time (almost). I guess I'm saying the same thing as the others; therefore, I'll do ya'll a favor and shutup!...LOL! Like people, give them time and u will be rewarded.
Tracy50