Yes. Widows generally keep their husbands last names, otherwise it would be too complicated too change passports etc to maiden names.
The proper title for a widow is "Mrs." followed by her deceased husband's first and last name. Alternatively, she may choose to keep using her married name if she prefers.
It should be Mrs (husband's Surname), However, when I had to write to my granny to thank her for Christmas presents/easter gifts/etc in the 1960's. I was always taught that my grandmother had to be addressed as Mrs (Husband's initial) then (Husband's Surname).
The husband's name goes first: Mr. & Mrs. John Doe.
If you are writing to a widow whose last name is different from her husband's, you should use the title "Ms." with her name ("Ms. Brown," not "Mrs. Brown"). Even though she may use a different name from her husband's, it is unlikely that she would be upset if you used her husband's name ("Mrs. Smith" instead of "Ms. Brown"). After all, that name connects her to the man whose loss she is grieving, so she might like it.
technically, yes, since you two did not divorce
Say her name was Marjorie Jane Foster and her husband's name was Fred Arnold Smith - (Foster was her father's name):-When her husband was alive you would normally address her as Mrs. SmithWhen her husband dies most ladies keep their married name and continue to be known as Mrs. Smith.When you addressed the envelope you would send it to:Mrs. M.J. Smith
The surname of the man who is the husband is used to call the women that's is the wife. So if the husband is called Mr. Williams Kennedy, where Williams is his surname then the wife would be that. In this case the two would be called Mr. and Mrs Williams. You can write it two ways: Mr. and Mrs. the guy's last name, or Mr. and Mrs. the guy's first and last name.
You would address it. Betty weaver Tully. For example: Mrs. John Tully. John would have been the husband who died.
The envelope should be addressed to: Mr. & Mrs. John Doe (his wife should be included as deceased was her mother-in-law.)
Commonly the wife used to take the name of her husband. For a few years now it is permitted to add the wife's maiden name to the name of her husband (Miss Durant marrying mr. Dupont could be called mrs Dupont-Durant, and her children too) or even to retain her original maiden name. The usual way is still to take the husband's family name.
Her given name is Eunice, but her husband Thurston calls her "Lovey."
Mr. and Mrs. (sometimes husband's middle name) (last name) or (name) and (name) (last name)