Which of the two brothers in The Scarlet Ibis do you understand and feel sympathy for?

“The Scarlet Ibis” presents two brothers, the narrator and his baby brother Doodle. Doodle is born when the narrator is six years old. He is born with a deformity of sorts, as he “seemed all head, with a small shriveled body” at birth. In fact, it is thought that he would not live long and a “mahogany coffin” is made for him in advance. His parents call him William Armstrong, a name that the narrator thinks as most appropriate “on a tombstone”.
The reader cannot help but sympathize with Doodle. Even his mother is moved to tears when she explains to the narrator Doodle’s situation—the baby boy is an invalid who would never be able to play with his older brother as other normal children do.
Therefore, when Doodle learns to crawl, the whole family is awestruck! The reader feels happy that all is not lost. There is hope that something may eventually come of the boy’s difficult life, and that he would not, after all, spend all his years lying in a bed, unable to move.
Since Doodle cannot walk, his father makes him a go-cart. The narrator finally gets the playmate he has always yearned for, because he is now able to take his brother with him outdoors, to his favorite place, Old Woman Swamp. When the narrator explains their trips to Old Woman Swamp, and how they’d “collect flowers of all kinds to weave into necklaces and crowns”, the reader is happy that the brothers are content in each other’s company. The reader is happy that Doodle is able to enjoy the beautiful things that life has to offer, in spite of his difficult health problems. We put ourselves in Doodle’s shoes and imagine what life would be like if we were always sick and had to be careful with every single thing that we did. Even when the narrator is mean to Doodle, as all siblings are sometimes to each other, the reader is still able to see the underlying love between the two.
Doodle’s brother determines to teach him how to walk at five years of age. This is because he is embarrassed by having a brother who cannot walk. After a lot of practice, Doodle does learn how to walk against all odds. The reader is drawn to Doodle’s determination at self-improvement. However, his brother does not stop at that. His pride makes him want to teach Doodle much more, perhaps more than Doodle is really able to achieve. He unintentionally works Doodle to his death. The reader weeps for the dead boy.