Oliver de Boys is the eldest son of Sir Rowland de Boys. He treats his younger brother Orlando in a very bad manner, treats him like a servant. He even plans to kill Orlando and is very jealous of him. He later falls in love with Celia in the Forest of Arden and displayes the love theme of Love at first sight.
Oliver de Boys is the oldest son of Sir Rowland de Boys, which makes him the older brother of Orlando and Jaques de Boys (not to be confused with Jaques the melancholy clown). Because he's the oldest, Oliver has inherited just about all of his dead father's fortune and he's also been put in charge of looking after his little brothers. You probably noticed that Oliver isn't exactly the nurturing type. He treats his little brother Orlando like he treats his servants, refuses to pay for Orlando's schooling. Still, Oliver's not just a tightwad – he's also a would-be murderer because he tries to have Orlando killed by the court wrestler, saying he'd just as soon have Charles "break [Orlando's] neck as his finger" I hope I shall see an end of him; for my soul, yet I know not why, hates nothing more than he. Yet he's gentle, never schooled and yet learned, full of noble device, of all sorts enchantingly beloved, and indeed so much in the heart of the world, and especially of my own people, who best know him, that I am altogether misprised" It's pretty obvious he hates his little brother because Orlando is inherently good and people like him more than they like Oliver. In other words, Oliver is mean-spirited and hateful for no good reason, which means his character doesn't have much depth. This becomes even more clear when Oliver undergoes a sudden "conversion" in the Forest of Arden after his little brother saves him from a "green and gilded snake" and then a "hungry lioness".