"Against his wives' wishes"
Case confusion: For "Gegen den Wünschen seiner Frau." why "den" and not "die" I thought it was accusative case and "Wünschen" is plural, so I should use "die". (If it is dative case then the same question applies to the singular answer "Gegen den Wunsch seiner Frauen")
Which case is it and is there and error here?