Gravity

How many screenplays do you know of that are written by a father and son team? If anyone out there knows the answer, do let me know.  My research shows that Alfonso and Jonás Cuarón have achieved a first of its kind.  Whats more, they could not have a better job.  Although the rest of the world seems to be panning the script, I thought, it was well written and effective (but then I am just a lowly amateur).