Introvert - Extrovert

Faye was a girl, 4 sisters, 2 mums and a dad. She was the second born of her dad, but the first and only born of her mum. Without a doubt the smartest but also the most shy. She was introverted and normally sad or upset. On the other hand, her younger sister Zaya was dumb, confident and extroverted. Zaya was always the baby of the house and got what she wanted, even after the other two girls where born. Faye and Zaya, being complete opposites, hated each other. Zaya craved the smartness of Faye, Faye pleaded for the confidence that Zaya had.
In this case 'Sisterly Love' was not true. Deep down, they didn't love each other, They wanted to be each other.