That's fine, or The John Doe Family.
Mr John Doe and family
You would address the letter to John Smith III. This is the proper way to denote that he is the third person in his family line with the name John Smith.
It is proper to address Mr. John Doe PhD as Dr. John Doe. You might also address Mr. John Doe PhD as Mr. Doe or Doctor Doe, depending on which reference he prefers.
Master John Doe
Just write " The Doe Family "
I would address it John Smith and family
The proper way to address that letter would be "Mr. and Mrs. John Doe."
* Proper address for a General and his wife: General & Mrs. John Smith.
If it was one of the parents of the husband or wife's or child and you know the two people well you would put 'John & Jane' (the card says the rest) and sign it with 'My sincere sympathies to you and your family ____________. If the husband has passed away then address the card to the wife 'Jane' or 'Mrs. Jane Doe' and if it's the wife that died then address the card to 'John' or 'Mr. John Doe.'
The address of the John And Lydia Workman Family Organization is: 1683 Angels Way, Kaysville, UT 84037-9563
I think it would be proper to address the two married PhDs as Drs. John & Jane Doe
If the Pastor who is the third and not a Junior is the only Pastor then you address him and his wife: Pastor & Mrs. John Doe. If all three were Pastors then you would address the letter as: Pastor John Doe,III & Mrs. John Doe.