A father-son balancing act that never finds a satisfactory equilibrium, John James' debut doc Siempre, Luis introduces a man, Luis Miranda, whose career as a political power broker would, in some quarters, be considered deserving of a documentary. But this film knows its best shot at attracting viewers lies elsewhere: in Miranda's efforts to mount a Puerto Rico benefit production of the blockbuster musical Hamilton, which happens to have been created by his son Lin-Manuel.