In Coco (2017), when Miguel meets his family, and through all the movie, he always calls his family members like "Tia Rosita" (aunt Rosita), "Tia Victoria" (aunt Victoria) and so on. The only one that he calls "Papá" (dad) is "Papá Julio" (dad Julio).
Since the "family tree" that is shown in the movie begins with "Mama Imelda" and her daughter Coco, we can safely assume there are no more kids to "Mama Imelda", therefore all this "tios y tias" (uncles and aunts) must be related to Coco.
Is "Papá Julio" Coco's husband? and therefore, Are the "tios and tias" Julio and Coco's kids?