Children of Addicted Parents and People

Hi this is a bit random but thought someone may be able to give me words of wisdom! I am getting married next year - I will be 26 then, and I kind of think that the 'morally right' thing to do would be to invite my dad. However, my fiance is dead against it which I understand - he doesn't want to introduce his parents to an alcoholic who used to be violent and has been in prison, plus pose for photos with him etc etc. Also, I don't even speak to my Dad and I don't really have any interest in getting back on speaking terms. Yet I still feel this niggle about the wedding. I know he will find out and see pictures from other family members and I will feel guilty if he is upset. But then he's been such a s**t should I really care? Please help! I know the wedding is a year away, but this is really playing on my mind.