What sort of behavior does Atticus expect from his children? how does this please him? Why should Scout expect to act like a lady, and Jem to act like a gentleman?

He expects his children to act like proper young pupils.

Atticus expects his children to respect others and at least attempt to empathize with them. Although they don't always please him, Scout and Jem certainly grow up with the progressive traits of their father. Both Scout and Jem stand up for what is right when they need to. A great example of this is when they both face the mob at the courthouse who are threatening Atticus and Tom Robinson. SCout shouldn't have to act like a "lady". She already has very human traits that don't need stereotypes. Jem develops into a fine gentleman like his father.

Agreed Aslan