Thank you. So would the sentence still be a prepositional phrase with who? Or would it become a relative clause? I'm sorry if the sentence can be the both at the same time.( I don't know of prepositional phrase at all)
Thank you Clive, the link you gave from now on is on my learn-list. Also does the I'm sorry part look weird to you? Having written it, I noticed I made a mistake, I guess.