Board Thread:TFiOS Discussion/@comment-50.81.216.10-20151217142059

“He is the best friend of Isaac and Hazel Grace’s boyfriend,” could mean:

1.    Isaac & Hazel have a boyfriend who is Gus’s best friend; 2.    Gus is Isaac’s best friend and Hazel Grace’s boyfriend.

Clarity in writing is an essential tool of communication. Your sentence falls woefully short of its goal. 