It should be addressed to The John Smith Family. Alternatively you could say John Smith and Mary Jones and family but that is a lot for one line and you shouldn't put people on separate lines unless they are unmarried.
You can learn how to address an envelope at the USPS website. They can also teach you how to address an envelope for International mail. A good place to go to teach children to address envelopes is on the nhcs website.
The return address on the envelope may be different from the sender's information inside the letter. Additionally, the recipient's address on the envelope may differ from the address mentioned within the letter's content.
You can address the envelope to a widow as: Mrs. Jane Doe (Doe would be her husbands surname) or, you could write Mrs. J. Doe on the envelope. Even though she is a widow she still has the surname of her husband until she either decides to change it to her maiden name or remarries.
Addressing an envelope to a male child use to be 'Master', but now it can be Mr.and the female Miss.
how to write correct address on the envelope to Lithuania
To address an envelope, write the recipient's name, and, beneath it, address.
When addressing a standard envelope, the correct location for the return address is the upper left corner of the envelope.
It will NOT be returned to the sender that is for sure if it does not have a correct return address on the mailed envelope and the one that it was mailed to has a incorrect address or does NOT accept the mailed envelope.
The correct way to address an envelope to a married couple that have different last names is to use both of their names. For example, you could write Mr. Johnson and Miss or Ms. Dwyer.
The proper way to address a mailing envelope is to place the stamp at the top right corner, add the senders return address on the top left corner of the envelope with the recipients full name and address in the middle of the envelope.
The same as you would a short envelope.
Address on envelope to a doctor: Dr. John Doe is the general form.