Using c/o in a letter?

Question

I want to write a letter to someone (Person A) who is going to communicate with our office on behalf of her elderly mother (Person B). Would I use "c/o" in the greetings line, for example:

Dear Person B (c/o Person A):

OR do you have a suggestion for how to address Person A?

Thanks for any help - I can't seem to find the answer to this anywhere else!

AlpheccaStars · Accepted Answer

C/o is used for the address.

For example, supposed Mary Smith has rented a room in Jane Doe's house.
Mary Smith does not have an address of her own, so the letters must go to Jane Doe's house.

In that case, you address the letter:

Miss Mary Smith (the person who will read the letter)
c/o Miss Jane Doe (the person who picks up the letter from the mail box)
123 Main Street,
Anywhere, NY 12345

Inside, your letter is written to Mary Smith:

Dear Mary,
I haven't heard from you in a long time.
...

Love,
John
---------------------
Your case is different.

Suppose Mary Smith is Jane Doe's mother, and you want to write directly to Jane Doe, then the address is:
Miss Jane Doe
123 Main Street,
Anywhere, NY 12345

Dear Ms. Doe,

We are writing you regarding your mother, Mary Smith. We understand that you are representing her...
...

Using c/o in a letter?

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