Since it has been 24 hours may I take the liberty to add more than 3? They may no fit the profile exactly though.
8. As Long As We Both Shall Live - movie. A sort of Cinderella story. She is compared not just to her half/step ? sister but to basically everyone in that world. She is shunned because of it.
9. Mob Psycho 100 - two brothers (both in high school), one with psychic powers, the other without. Without compares himself to the one with. Parents always holding the one with up against the one without and saying he should be more like the one without (academics, gracefulness, athletics...).
10. Love Stage - both in show biz.