Coco follows the secret musical ambitions of Miguel, who resides in a lively, loud Mexican village but comes from a family of shoemakers that may be the town’s only music-hating household. For generations, the Riveras have banned music because they believe they’ve been cursed by it; as their family history goes, Miguel’s great-great-grandfather abandoned his wife decades earlier to follow his own dreams of performing, leaving Imelda (Miguel’s great-great-grandmother) to take control as the matriarch of the now-thriving Rivera line and declare music dead to the family forever.
http://www.ew.com/article/2016/12/06/pixar-coco-cast-plot?iid=sr-link1