Meeting my father after Twenty-two Years

For those of you who know me, I am a very private person. But being that I am among my Brothers I would like to pose a question. You can respond by replying to this post or back channel (email or phone is fine).

Without going much into my background I haven't seen my father in twenty-two years. No, that's not a type-o. This coming weekend, I am going to visit my younger Brother in DC and, since my father will be four hours away (and since he's told my Brother to ask me to contact him), we are going to drive over and see him as well.

Currently, the only thing that I feel is anger. I want my children to at least meet their grandfather probably more than I want to see him myself. So, I need some advice. I know that it may be hard to put yourself into my shoes, but how would you handle this situation? Do you think that I should even make an effort after so long?