In human terms, this would be considered incest and would be frowned upon universally, but it’s a regular occurrence among cats, particularly when there is a desire to reproduce a trait in a particular breed. The idea is: a
kitten is born with a physical trait that a cat breeder likes and then tries to reproduce in kittens. This is done by crossing the kitten who has the desirable trait (when he or she matures, obviously) with the parent.
