the books dont really matter,the show is clearly doing things different,also how is he going against the kings wishes?did the hand force him to marry his daugther?? otto thinks its better if the king has more kids(thats aobjectivly a good thing for their family and the well being of the realms) and for a male to rule (yes its sexist,but at the end of the day if the entire realm is sexist against female rule,its better for peace and stability to give them what they want)