Eventually I'll have a babtshower..

Should I invite my ex's parents even though they have made no effort to contact me?

I think I am going to, because it is polite, but I don't really want to see them >_<

I feel like it is the more mature route to take though.

I wouldn't just because I wouldn't want drama at my baby shower.

If they haven't been in contact, I wouldn't bother. It would be the polite thing to do if they were reaching out to you. It may be as awkward for them as it is for you, and by not inviting them you may be doing everyone a favor.

That's true. I definitely don't want any drama.
My ex all ready told me not to put in effort with anyone if they don't put in effort too.