He scowls at his brother and everyone surrounding him

Why can't they surround him?

They all smile at his brother

Why can't they smile for him?

They're all excited to hear his brother's stories

Why can't they be excited to hear his stories?

They all shower his brother in compliments

Why can't they shower him in compliments?

They all give his brother gifts

Why can't they give him gifts?

They all think his brother is adorable

Why don't they think he's adorable?

They all care about his brother

Why don't they care about him?

As he sees everyone do these things to his brother he feels the jealously cloud his mind and heart along with something else

Loneliness