Dear friend,
Cats can absolutely recognize a familial scent. She may not know this is her sister but she can certainly tell this is a relative.Cats can also recognize humans from the same family. Once my first cousin came over and my cat (who had never before seen him before)- went right over to him and sat on his lap.
The male, who may be a little more standoffish will soon warm up to her as well.
Please let me know if you have any more questions or want to dicuss this more. I will be happy to help in any way possible.
Best of luck with your lovely furry children,
Warmest best wishes,
Terri
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