Liar fanfiction- the lost father

I don't own the novel Liar by Justine Larbalestier

Micah's life has finally settled down- well not fully. She is still a werewolf and still has to take her hormonal shots every three months. However she is starting to learn how to live a normal life. That is until she receives a letter from grandmother telling her to come to the farm immediately. Grandmother is dying and there is something important she needs to tell Micah about her Grandfather. But why should she help her father find his identity after he ditched her? And who really is her grandfather? Most importantly, how did he manage to give birth to a normal child if the rumours are true and he himself is a werewolf.