<human>: A little background: 

My parents got divorced when I was about 18 months old. My father and I were relatively close when I was a kid, but haven't been close for at least 10 years. He remarried about 12-13 years ago, and once they had kids they basically cut me out of their life, causing a lot of emotional pain for me. I saw them once a year on Christmas with the rest of my large family, we would say a few words, then we would part. About a year ago he finalized his second divorce. He hasn't seen his children since then, and I haven't seen him for about 2-2.5 years.

That being said, my FH and I are having a small-ish wedding, 40 people at the ceremony, maybe 65-70 at the reception. I have already decided that I want my step dad to walk me down the aisle, as he has been a stable father figure in my life for a long time. 

My real dilemma is that I am inviting my biological dad's siblings, and his mom. I have always been close with his mother, my grandma, and I do want to spend the day with his siblings, but I know that he won't add to my wedding at all, in fact, he would make me nervous, sweaty and awkward feeling. I am worried that my grandma will throw a fit and tell me that although we've had our differences, he would really love to be there, which may or may not be true. 

On the flip side, if he does in fact still care about me, and just feels awkward about leaving me as a child/not trying to have a relationship with me as an adult, I am worried that inviting him will make him feel bad and seeing my step-dad walk me will be hard for him. 

I just don't know what to do, and would love ANY insight into the situation!

Can you give me the gist of the text in a nutshell?
<bot>: My biological dad and I aren't close, but I am inviting the rest of his immediate family, do I invite him even though it won't add to our special day?