Complex family; complex invites?

[Deleted User]

That wording wizard is helpful, but...
Here is the situation, ladies:
Our wedding is mostly paid for by us, with some gifts from family and friends to make it complete.  Our 'hosts' are actually the parents of my future husband's stepmother.

He has two sets of parents attending (thankfully they all get along well!):
His father and stepmother
and
His mother and stepfather.

My father is deceased.  My mother might be attending, though I don't anticipate her contributing much to the wedding.

So far, his mother and stepfather have provided much-needed support, but mostly in therapeutic, not financial, form.

The problem?
How do I word the invitation for our wedding, taking place on his step-grandparents' farm, so that it doesn't exclude any of his parents?

I feel strange putting "to his son, Christopher" when his stepmother is putting forth so much effort into the wedding and reception, plus, it seems rude to write the invitations in such a way that it seems like we've provided everything ourselves.  Do I have a better option?

HisCB

"bride and groom, together with their families blah blah blah"

and then on the programs, write out a thoughtfelt specific, yet equally honoring all, thank you to each contribitor.

or if you arent doing programs, you can do a speach at the RD thanking each person and presenting them gifts...

[Deleted User]

The problem is, the entire family AND his family know my mother's reputation, and including her under the family umbrella seems... I dunno... insulting to the other parents that are helping us so much.  But, on the other hand, if it's the best choice I have...