My (28f) fiancé (27m) is inviting his exes parents to our wedding. Am I wrong for being weirded out/slightly upset?

Obligatory on mobile.

It's just like the title says. My fiancé is wanting to invite his exes parents to our wedding. He does have a son with this ex, but she has no custody and is currently in drug court. I feel a little upset about it because I'm paying for 90% of the wedding and he has taken up valuable guest space for people that have nothing to do with either of our lives. He said he wanted them there for his son, but it's not his sons wedding. I love his son, I'm going to be adopting him after we get married, but I just think it's really awkward to invite his exes dad and step mother. I've never met them and he doesn't socialize with them either. Am I wrong for being upset about this? Should we be inviting them?

TLDR; My fiancé is inviting his exes parents to our wedding. Is it okay that I'm upset about it? Should I invite them?

EDIT: I should have put this in the original post. The mother has no contact because she is a meth addict and her father (the sons grandfather) spent 10 years in jail for meth distribution. That is why I am a bit upset about it. I'm just trying to see if I'm overthinking it or if other people also think it's weird for them to be invited. I'm not trying to come off as snooty or selfish or anything. I LOVE his son, he calls me mom. I've just never met this man before.

EDIT 2: The grandparents are going to be coming no matter what, I'm not going to uninvite them because my fiancé wants them there. I'm just trying to find out if it was okay for me to feel a little weird about it or if I was just overthinking. I've never met them before and my fiancé didn't even tell me he was inviting them, I was blindsided.

Final EDIT: Thanks for all of your replies. Even if some of them were erring on the side of rude. I spoke with my fiancé when he got home and he said that he doesn't even remember inviting them and that if he did it was only because his mother asked him to. I asked if I could meet them if they were going to be coming since I'd never seen them at any other events and he told me that it's because they don't get invited to any of the other big events (i.e his sons birthday, Christmas, Thanksgiving, etc). But, he said I could meet them if I wanted or that we didn't have to invite them at all since he hasn't spoken to the man since the guy showed up threatening to beat his ass because his ex told him that he was beating her when he wasn't (grandpa left and hasn't talked to his daughter since she lost custody). Either way, I'm sure he's a good man if he cut his family off to be around his grandson and apparently his wife is a sweetheart. I don't mind meeting them and extending a branch to see if coming is something that they would want.

Submitted February 21, 2020 at 02:21PM by Atnomercywaves https://ift.tt/2VoxaOn