Grooms parents are divorced.

Great advice everyone! Thank you for your support on this.

My two invitations I'm deciding between have one without parents mentioned, and one with. My parents are the ones divorced, so I was just going to have it say "together with their loving parents"... because that includes everyone, including my step dad.

My parents are separated as well. We chose to just put our names are inviting for the wedding.

Thanks everyone for the advice! His parents are divorced and have S/O but are not married to them; my parents are married. I was thinking of just putting my parents as Mr. and Mrs. and to put his parents as their full names.

Although neither of our parents are helping financially with the wedding, we still want to be able to honor them in the invitation and any other way that we can.

Unless they are co-hosting (ie financially contributing) or you really want to, you can actually easily skip including the parents of the groom on the invitation. Traditional structure for an invite would be:

FATHER and MOTHER LASTNAME

request the honour of your presence at the marriage of their daughter

YOURFIRST YOURMIDDLE

to

FUTURESPOUSE FULLNAME

at DATE AND TIME ETC

___

If you want to skip and name awkwardness and include everyone on the invitation you I'd go with Erin's suggestion or some form of it.

___

You can also skip all names with something like:

The honour of your presence is requested at the marriage of

YOUR NAME

and
PARTNERS NAME

___

If you want to include the FILs all by name I would do something like:

FATHER and MOTHER LASTNAME

request the pleasure of your company at the marriage of their daughter

YOURFIRST YOURMIDDLE
to
HIS FULL NAME

son of
STEPDAD and MOM Smith

DAD and STEPMOM Jones

(for anyone else working this out, I've done this for a bride and groom couple to meet the OP's situation, but amend any pronouns and titles as needed to apply it to a same sex couple or one with same sex parents)

I am in the same situation and was also running out of space on my card to add all the parents names etc. So we decided to go with "Together with our parents"

You could say something like "Jane Smith and John Hancock, along with their parents, invite you to join them in the celebration of their marriage".