Stuck in a Homophobic Family

A few years ago, I had come out as gay, but after several threats of being kicked out (By my father). I swore to 'no longer be gay', with the idea that everything will get better and hopefully they will graple with the idea. Now I'm almost getting my law degree in a year and I've had a girlfriend for the past 2 years (I am female), that they are unaware of. And he still mocks lesbians when he gets a chance, just to mess with me.The only thing that keeps me going is imagining his facial expression when I send him my wedding invite in a few years. Is it cruel?