Your advice on this situation?

my dad has been an alcoholic my whole life. i don't even really remember him sober ever. i don't remember him ever spending time with me, & as I'm growing up it's getting harder to deal with it. in 2007 he got into a car accident due from his drinking and his alcohol level was .2 points below the poisoning limit. & he quit drinking for 2 years and 2 months, the day he got married to his wife, one glass of champagne and he relapsed. & she was of course fine with it. she kind of manipulated him into thinking it was okay, and since his wedding he's stopped caring he would go 5 months without talking to me, & then call just to say that I was stupid because I had a C or he'd tell my sisters he didn't give a **** about us girls and recently he posted on facebook that she reminds him of his mom, whom by the way passed 11 years ago last week and she was the opposite of his wife. My Grandma was smart, beautiful, classy & she always put family first and that threw me over the edge, anyways, what's your opinion? How should I deal with this?