Tbh I don't get what this means all the way but it seems like the parents want their children to surpass them or be better than them like have better jobs change the world more than they did that's what I get from this little sentence
Mood is the overall feeling that the details in a description add up to
The play's villain, Iago, is the epitome of dishonesty and his untruthful nature is contrasted with the innocent Cassio and Desdemona. He uses his skills in deception to lie to almost every other character in the play in particular Othello, but also to Roderigo and Cassio.