Mrs. Greta & Mr. Neal Featherston, Jr.
You would address for a Junior: Mr. & Mrs. John Jr., or, Mr. John Jr., and Mrs. Sarah Smith.
The name followed by Jr For example: John Doe Jr
Mr & Mrs James Angstrom Jr.
Example : Mr & Mrs Edward J. Flynn Jr.
When the husband is a 'Jr.' and your letter is formal and not private you would address it (example:) Mr. John Doe, Jr., and Mrs. Jane Doe or it is still fine to put: Mr. & Mrs. John Doe, Jr. If you know the couple as friends then in the letter or note you can just put their first names and drop the Jr.
* Depending on the individuals status it would be: Mr. & Mrs. John Doe. If the man was a doctor then is would be: Dr. & Mrs. John Doe. If the woman was a doctor and her husband wasn't then it should read: Mr. John Doe & Dr. Jane Doe or (some professional women keep their maiden name and take their husbands name it would be: Mr. John Doe and Dr. Jane Smith-Doe.
mr ans miss or.... for mrs is madame. mr ans miss or.... for mrs is madame.
There has been a small change in social convention over the past decade. The appropriate address, in traditional circles would be: Mr and Mrs John Doe Jr. However, it is now an acceptable address, outside of more traditional societies to address your letter as John and Mary Doe Jr. When there is a hyphenated name, such as when a spouse has elected to retain her married name, the form would be: Mr. John Doe Jr Ms. Mary Smith-Doe, Jr. Address
I would address it to Mr and Mrs David Keys. For the salutation I would use Dear Mr and Mrs Keys.
Mr. and Mrs. John Smith III
Mr. and Mrs. James Bitner III
As Mr & Mrs.