No, I wouldn't invite them.
Showers are NOT "be all important events" where distant (distance and emotional!) family should be invited. It's not a wedding (and heck, even if it was, i'd probably be saying the same thing!).
These people aren't a part of your life. This is a gift giving event. If you want to make any overtures to try and start to be involved w/ them, do it outside of this shower. Don't make the shower the olive branch.
Showers are supposed to be about the people you are close to in life, who want to support you and your new baby.