House of Broken Angels easier to grasp on 2nd reading but why no family tree?

Began re-reading Luis Alberto Urrea's novel The House of Broken Angels in preparation for Sunday meeting of book group, and certainly in hopes of bringing this extremely complex family saga back into my memory and consciousness in some useful and organized manner. No doubt it's easier going through this novel a 2nd time; in first reading I was impressed numerous times by the wit and by some excellent scenes and sense of place, but I had a really hard time keeping the characters and the chronology straight. Somewhat better second time through: Now I know that Big and Little Angel, half-brothers, one 70 and on verge of death and the other in his 50s and the only family member who is half-white/half-Mexican-American and the only one living in what seems to be another world, an academic post in Seattle. I also see more clearly now that there are 3 phases to this novel: Part 1 involves the funeral of Big Angel's mother and the ensuing family gathering; part 2 gives the back story of the family, beginning with Big Angel's father, Antonio de la Cruz, working as a motorcycle cop in a small city on the Baja (I think), La Paz, and abandoning the family to pursue another woman and move to Tijuana and later to San Diego, and in this section we also see Big Angel in youth, falling love w/ Perla, who will be his wife of 50 years, and giving some important background on his brothers, or as we learn half-brothers, and his emigration north to escape abuse at the hands of a cousin who runs a fishing boat - lots of stuff, and some great descriptions of life on the Baja and some dramatic scenes of confrontation and flight. The 3rd part - haven't gotten there yet in the re-read - is teh 70 (and final) b-d gathering for Big Angel, where we meet many of the younger generation and see family history repeating itself in some fashion. Yes, the novel is better because more graspable on 2nding reading; I still don't know why Urrea didn't make things a little easier for us by including a family tree - even G Garcia Marquez did that!