The theme of Chapter 4 is new beginnings. I think this because George, Miguel, and Andres all now have a new beginning. They are putting their past of gangs behind them. George is now a part of the Catholic Church and Miguel cooked a turkey by himself. Also now Andres does his own grocery shopping.
My favorite story in Chapter 4 was also the saddest. It was about George and his brother Cisco. George just got baptized but then he found out his brother had died. This was my favorite story because I relate to George. I know what it's like to have something happy or exciting happen, but then find out a not so good thing happened. However you should always try to be positive like the poet Galway Kinnel writes, "Sometimes it's necessary to reteach a thing it's loveliness."