Mr. and Mrs. David Mielke III
Mr and Mrs is correct or Mrs and Mr is correct
Mr. and Mrs. James Bitner III
In the US it is normally Mr. and Mrs.
When addressing Mr. and Mrs. with a III, you would typically format it as "Mr. and Mrs. John Smith III" if you're using the husband's name. If you prefer to use the wife's name, it would be "Mr. and Mrs. Jane Smith III." The Roman numeral III indicates that he is the third in a line of individuals with the same name.
Mr. and Mrs. John Smith III
Mrs. Janet Clause III
The correct way to type that would be Mrs Graves' classroom.
I would address it to Mr and Mrs David Keys. For the salutation I would use Dear Mr and Mrs Keys.
No, it is Dr. and Mrs. Ramesh
"Dr and Mrs Smith" is the correct salutation. (With Smith replaced with the correct surname)
The correct title is: Mrs. Jane Doe & Miss Kate Doe.
In some circles the traditional form "Professor and Mrs David Wilkinson" is acceptable; but social change has made "Professor David and Mrs Mary Wilkinson" the widely preferred form.