So I could really use some input! My fiancee and I are each products of divorce. Both of his parents are remarried, get along well with each other, and are willing to help us out a little bit financially for the wedding. My father is remarried, my mother is in a long-term unmarried relationship, and I consider the guy a full step-father. My parents DO NOT get along. My father is pitching in somewhat, but my mom and both of his parents are helping out a lot more. I think we should include all or none of the parents on the invitation, but I don't want to slight the future in-laws or my mom since they are all being very generous. We are paying for the bulk of everything, but we really couldn't dp this without their contributions.
In summary, my questions are:
Do we include all the parents on the invitation?
If so, do I include my mother's boyfriend (that will be 5 different last names on the invite)?

Just to explain where I am at, we've been engaged since last June, and we have only recently decided what city we're having the reception in (since his mom is in another state).

Thanks for any help you can offer!

Another option is to mention them without individual names, ie...Bob and Sue, together with their parents invite you to attend...
However, if you want to include the names, you are only limited by the lines provided in the invitations.
Another idea is to change the format to a letter style wording, ie...
We cordially invite you to witness the marriage of our children, Bob and Sue...blah, blah, blah...Then list all of their names at then end. I believe the ettiquette on listing of their names is Mother of Bride and boyfriend first, Father of bride & spouse 2nd, Mother of Groom & spouse 3rd, and Father of Groom & spouse 4th.
I wouldn't consider how much each is contributing into the equation.

We don't have this problem as much, but wanted to honor our parents, even though they are not helping all that much. We have wording along the lines of Leanne and Clinton, along with their families, invite you to celebrate in the blah blah blah.