Unless one is so addicted that one's obsession with catfighting impacts his life negatively OR if one has a very open relationship with family about sexual things, there is no reason to share this or any sexual fetish with family other than wife or girlfriend.
There is always a chance that they might find it weird or worse, objectionable, and that can just create an awkward situation and take the fun out of it. Beside parents are smart and they probably have an inkling anyway, esp if they find your stash
