When addressing 50th anniversary invitations is it wrong to put the anniversary couples return address on envelopes or does etiquette dictate it be someone elses address in the family?

* If the couple who are having their 50th wedding anniversary is putting on the party themselves (many couples do) then yes, they should put their return address on the envelopes. If it's a surprise 50th wedding anniversary by a member of the family then the return address should be that family members address or they would spoil the surprise.