Rule #6: A child conceived from the union of two lycanthropes (i.e. during mating season) will develop lycanthropy when the child biologically becomes an adult.
I have previously proposed that two people with lycanthropy cannot get near one another without involuntarily changing into werewolves and fighting to the death; however I also posited that this rule could be trumped by two lycanthropes shacking up during mating season. So then, what of their offspring?
Congenital lycanthropy will not manifest itself in the child until puberty. As such the parent lycanthrope must be very careful because there is no love among creatures as evil as werewolves. Once the lycanthropic gene expresses itself in the child (at puberty) the child and lycanthrope parent must part ways forever lest they both involuntarily change into werewolves and fight to the bitter end.
The properly raised child will not need a guardian when the time comes. With some preparation the youngster will set off in the world mentally ready. Such children, when raised with care, have a built-in lycanthropic advantage of being independent and precocious.