Is there any difference between "one's friend" and "a friend of someone"?
Native speaker’s answer
Rebecca
There is no major difference in meaning between "one's friend" and "a friend of someone" – only some very subtle differences in usage. "A friend of someone" is a little more “distant” or non-specific about the person than "one's friend". Ex: His friend Luke lives in London. Ex: A friend of his from school lives in London.