Wedding invitation, addressed to The Us Family, reads:
Blah and Blah
have much pleasure in inviting you to a service of blessing at blah college Chapel, at 5pm on blah and to a reception in college, following the service.
What should the formal (or not so formal) reply be? I'm a bit stumpted 'cos the envelope was addressed to us as a family, and normally you say something like 'Mr and Mrs have great pleasure ....' or something like that. TIA