What is brother in east of eden?

In East of Eden by John Steinbeck, the character of Charles is the brother of Adam Trask. Charles is the older brother and feels resentful towards Adam because he believes that Adam is their father's favorite son. Charles is described as being physically strong, with a violent temper. He also has a scar on his forehead, which has been the result of a childhood accident. Charles is often jealous of Adam's success and decides to go off to war to prove his worth. When Charles returns from the war, he finds that Adam has fallen in love with Cathy, whom Charles despises. This leads to a violent altercation between the two brothers, and Charles leaves the ranch for good. Overall, Charles is a complex character whose actions are influenced by his deep-seated resentment and jealousy towards his brother.