How does Tiny Tim help Scrooge?

The character of Tiny Tim helps generate sympathy for Bob Crachit, who cannot afford the medical care the boy needs, and to increase the animosity toward Scrooge, who simply will not raise poor Bob's salary. After all, what's worse: "I have a family to feed" or "I have a family to feed AND my son needs an operation"? He also symbolizes the helpless and needful people that Scrooge initially believes should just die and save the world the trouble of caring for them. He was seeing the impersonal and the generalization and Tiny Tim showed him the personal and the individual.
He is Timothy Cratchit the son of Robert (Bob) Cratchit who works as a clerk for Ebenezer Scrooge in his counting house and office.