"C/o" is what I think you have in mind. It is used on an envelope to say "in care of". I send a letter to my friend who is staying with another person for a while: I address the letter John Jones - c/o Susan Smith - and then her address.
Recently, c/o has also been used by students to refer to themselves as the c/o (class of) 2008.
People are waiting to help.
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