The father that was in and out of my life then disappeared long periods of time has now come back. How should I respond?

Anonymous
So after my mom and dad divorced he stopped coming around. I remember my mom used to drive me to his mom's house which was my grandmas and ask her where my father was. His mom would either say up to no good or in jail. My mom tried and when we didn't hear from him for months she'd call around to particularly the jails and that's where she would find him. Again he'd do good coming around then he'd dissappear. He never showed any of my birthdays, graduations, major events in my life. So I got used to not having a father. My mom ended up getting remarried 3-4years after the divorce. My father When he decided to come back again not got angry because I didn't wish him a happy fathers day. I told him I've gotten used to not having a father to say it to. When I asked why he stopped coming around he stated because my mom got remarried and that my grandma was an evil woman that's why she's dead now and it's her fault but reality is he physically abused my mom when they had disagreements. The neighbors are the ones who told my grandma.

Now he recently text me saying he's having surgery. What am I supposed to do? And what would you do? Should I help?
The father that was in and out of my life then disappeared long periods of time has now come back. How should I respond?
The father that was in and out of my life then disappeared long periods of time has now come back. How should I respond?
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