Why doesn't Urrea's House of Broken Angels include a family tree?

About 20 percent in (ridiculous Kindle edition doesn't even give you page #s!) on Luis Alberto Urrea's new novel, The House of Broken Angels, and am still trying to get my bearings. Is it me, the novel, or the Kindle format? I can't even remember most of the characters' names (that's probably on me, although a quick Google search of the title shows me that at least one reviewer notes that novels with such complex family relationships often - and should - include a family tree to help readers; GG Marquez did so!). The central character, Big Angel, is a 70-year-old patriarch of a large Mexican-American family living in the San Diego area; the novel opens as he wakes up and realizes that he (and the whole clan, who depend on him to keep them on schedule) will be late for the 100-year-old mother's funeral. We quickly get to meet his wife and several children and learn a little of his background, most notably that he worked in an office (the utility company?) and was extra-vigilant about keeping on schedule so as to combat the image of Mexican-Americans as perennially late. We also learn that he is mortally ill, has about a week to live, though he's kept this secret from his family (although they must know he's infirm, as among other things he's confined to a wheelchair). We have hints of various dramas involving family dynamics, particularly the relationship between Big Angel and his half-brother, Little Angel, who is half-Anglo and lives in Seattle where he is an English professor; there's a sense that he has betrayed his family heritage by these life choices and that rainy Seattle might as well be on another planet. The family does get to the service just about on time, where they (we) encounter several other siblings and their spouses, with a younger generation ever-present and speaking only in English (Big Angel and his cohort prefer Spanish but speak both at the needs arise; there are many Spanish words and phrases throughout the novel, but they're pretty easily deciphered by context alone for those who don't know the language). In short, the opening of the novel presents a lot of possibilities for plot and character development, but the story has not yet lifted off the ground.