I would like to send a welcome letter to customers who are listed as John Doe Jr and Sally Doe.
Would you write John and Sally Doe JR? Or as above? Is there a rule of thumb?
Are these people married? In that case, it would be Mr and Mrs John Doe Jr.
The salutation would be Dear Mr and Mrs Doe.
If they are brother and sister, then Mr John Doe Jr and Miss Sally Doe >>
Dear Mr and Miss Doe.