Are your cats spayed? I have two girls as well, and although one retained some serious attitude (which we laugh at now), they both calmed significantly after they were spayed. Did you get them both as kittens? If so, I'm guessing their ages to be about a year and three to four months - chances are the older one is still impressionable enough to be untrained by the baby's mischievous ways.
Good luck!
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-Danaë
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