Discuss the root or causes of the sibling rivalry between Florence and Gabriel. Is it repairable?

The rivalry between Florence and Gabriel was caused by their mother's obvious preference for her son. Gabriel was her favorite because he was a boy. He received all of his mother's attention, the best food, and the best clothing. Florence, however, was treated as a servant in her own home. As a result, Gabriel was spoiled and selfish, whereas, Florence became bitter and filled with hate. Whether or not their relationship is repairable is doubtful.