The theme of "Abuela Invents The Zero" to me is selfishness. I chose selfishness because Constancia only thinks about herself. She deosn't want to be seen with her family because she will be embarassed. She won't even help her lost grandma in church because she doesn't want to be made fun of at school.
It enhances his personality and portrays that he is very temperamental but also that his honor is very dear to him. At the same time it means he truly cares about his reputation to the point of sacrificing his life for it.
