Question
Do cats commit incest? If so, at what age would this behavior begin, and when should male and female kittens be separated from one another so as to avoid incest?
Answer
Cats, like most animals, will mate with any willing member of the opposite sex. So, yes, they will sometimes inbreed. Humans have been known to encourage that when trying to select for specific genetic traits.
Rather than trying to separate them -- they can hit puberty as early as 8 months, if I remember correctly -- I strongly recommend getting them surgically neutered, unless you are raising purebreds. There are already many more cats looking for homes than homes looking for cats.
Answered By - keshlam