This sentence is right and you can use two prepositions in this sentence structure. However, saying "My father's friend is Tom" is also right but this structure does not require two preposition because we have omitted the word 'name'.
1 year ago
Last edited at 12:54AM on 2/26/2013
Hi.~ My father has a friend named Tom. You cannot use two owning prepositions in one sentence. Your father does not own "Tom," at least, I don't think he does.. does he?? Haahaa! You also are not hyphenating it because the verb would have to be "is" . Ex; Tom's a friend of my father. That is using it as "is" being the verb. A friend of my Dad is Tom. You wouldn't let your dad own that " Is" verb either. Tom is the subject in this example. In other words, you are right! You cannot use the prepositions as you have. The above mentioned ways to word that sentence will help the reader to understand what you're trying to say clearly! Good of you to ask and have a great night!