Invitations...Post your wording

We are hosting and this is ours:

Jennifer Anne Doe
and
Matthew Paul Smith
together with their parents
Mr. and Mrs. Thomas Doe
and
Mr. and Mrs. Gregory Smith
request the honour of your presence
at their wedding
on Saturday, June twenty-first
two thousand and eight
at eleven o'clock in the morning
Giorgio's at Foxhill
1 Foxhill Drive
Baiting Hollow, New York
Reception immediately following

(I dont have the copy in front of me but pretty sure this is it exactly)

how are you setting up your RSVPs?

my question is what if you inviting 4 people on an invite but only 2 can go...how do you know?