Wedding Invitation Wording when both sets of parents are funding the wedding:
Mr. and Mrs. Brides Parents
and (or together with)
Mr. and Mrs. Grooms Parents
request the honor of your presence (or request the pleasure of the company of)
Guest Name(s)
at the marriage of their children
Brides Name and Grooms Name
On
Wedding Date
At
Ceremony Place Name
Ceremony Location
At Time
Followed by a reception at
Reception Place Name
Reception Address
At Time
RSVP (or Please return the enclosed RSVP by)
RSVP Date
RSVP Address Details

Wedding Invitation Wording if Bride's parents are hosting, but would like to include grooms parents on the invitation:
Mr. and Mrs. Brides Parents
request the honor of your presence (or request the pleasure of the company of)
Guest Name
at the marriage of their daughter
Bride to Groom
son of Mr. and Mrs. Grooms Name
etc.

Wedding Invitation Wording when the bride and groom are paying for the wedding themselves, the wording could read:
Dear Guest Name
Together with their parents,
Brides Name
and
Grooms Name
request the honor of your presence (or request the pleasure or your company)
to celebrate their marriage
etc.

Wedding Invitation Wording when Brides parents are divorced, issued by the parent who raised her:
Ms. Brides Mother
requests the honor of your presence (or request the pleasure of your company)
at the wedding of her daughter
Bride to Groom
etc.

Wedding Invitation Wording when Divorced parents are hosting the wedding together:
Mr. Brides Father
and
Ms. Brides Mother request the honor of your presence (or request the pleasure of your company)
at the marriage of their daughter
Bride to Groom

Wedding Invitation Wording when a Divorced parent and new stepparent are hosting the wedding:
Mr. and Mrs. Brides Stepparents Name 
request the honor of your presence (or request the pleasure of your company)
at the marriage of Mrs. Brides Mothers daughter
Bride to Groom
etc.

Wedding Invitation Wording for a Child of divorced and remarried parents both hosting the wedding:
Mr. and Mrs. Brides Parents Names
and
Mr. and Mrs. Grooms Parents Names
request the honor of your presence (or request the pleasure of your company)
at the marriage of their daughter
Bride to Groom
etc.

There are many ways you can add in your own wording to add a personal touch, we have listed a few various scenarios. If you need any help with your wording please feel welcome to contact us for advice. These are suggestions only, don't forget that wording should reflect your own personal taste and style as well and the level of formality you would like on your day.