Call her ma'am. If written, Ms. Jane Doe is acceptable.
You can address a letter to two doctors as: Drs. John & Jane Doe.
A PhD is a doctor. You address a letter to him Dr. John Smith. If he is married you address it Dr. John and Jane Smith. If she has the PhD, you address it John and Dr Sue Smith. If both have their PhD's you address it Drs, Henry and Jane Smith.
When you are addressing a letter to married doctors it would be: Drs. John and Jane Doe.
If you are using "Mrs.", you must use the husbands name: Mrs. Harold Happy NOT Mrs. Jane Happy If you don't know the husband's first name, then use: Ms. Jane Happy
Assuming you mean a woman with the title "Lady". On the envelope put "Lady Jane Doe" before the location address. For the salutation in the letter use "Dear Madam" or "Dear Lady Jane" If you are talking about a woman who holds a position of power (e.g President) Use "President Jane Doe" on the envelope. "Dear Madam President" in the salutation If you mean any woman, use Miss or Mrs. before her name on the envelope if you know her marital status, Ms. if don't (or if this is her preference). The salutation should be "Dear Miss/Mrs./Ms. Smith" if the letter is formal, "Dear Jane" if a friendly letter to someone with whom you are on a first name basis.
Jane
No, it should be Mr. & Mrs. John Doe. You only use 'Ms.' if you are addressing a letter to someone you do not know is married or single or; in these modern times some women prefer you address them as Ms.
I was always told that you never seperate a man's name. So, if you are addressing a card or envelope informally, and the couple is married, it should be addressed: Jane and John Doe
The address should read: Drs. John and Jane Doe or, Dr. John Doe and Dr. Jane Doe.
Yes Yes, to a woman named Jane and they have a son named Paul.
Mr John and (Rev) Mrs Jane Jones