adress help

Am I supposed to put & instead of and?

also,
If its Ms. Susan Brown and Mr. Michael White is it on one line or

Ms. Susan Brown
Mr. Michael White

I'm stuck! Please help!

Someone posted that before

Married Couple with the same last name
Example:
Mr. and Mrs. William Harbin
123 Anywhere Lane
Anytown, NY 12345
Outer: The husbands full name (no nicknames), preceded by 'Mr and Mrs'
Inner: Dont use first names; in this case, it would read 'Mr. and Mrs. Harbin'

Married couple with children under 18 living at home
Example:
Mr. and Mrs. Bradley Burleston
123 Anywhere Lane
Anytown, NY 12345
Outer: Childrens names are left off the outer envelope
Inner: 'Mr. and Mrs. Burleston' on the first line; childrens first names on a line below.

Married Couple in which the woman has kept her maiden name
Example:
Ms Olivia Olsen
and Mr. Ethan Hayes
123 Anywhere Lane
Anytown, NY 12345
Outer: The wifes name appears first, on its own line; 'and' indicates marital status
Inner Place 'ms> Olsen' on the top line; 'and Mr. Hayes' is written below.

Married couple in which the woman is a doctor
Example:
Doctor Julie Walker
and Mr. Jonatoan Burns
123 Anywhere Lane
Anytown, NY 12345
Outer: The womands name is written above her husbands. 'Doctor' is spelled out.
Innter: 'Doctor Walker' is written on the first like; 'and Mr. Burns' appears below.

Unmarried Couple living together
Example:
Miss Christine Stein
Mr. Joshua Richmond
123 Anywhere Lane
Anytown, NY 12345
Outer: The guests names (ladies first) are written on two lines, without 'and'
Inner Write 'Miss Stein' on the first line, with 'Mr. Richmond' below

Single person with a date
Example:
Mr. Matthew Paris
123 Anywhere Lane
Anytown, NY 12345
Outer: Address this envelope to only the guest you know personally
Inner: The words 'and guest' are added after 'Mr. Paris.'

Extra Tips:
Never use first names on the inner envelope, except for childrens.
Spell out state names, plus words and terms such as 'street' 'road' 'Avenue' 'Apartment' etc.
Whenever a woman's name appears independently - no matter the reason - it always goes on the first line.
Include titles such as 'doctor' or 'judge' only if guests use them both socially and professionally.