Ever since Serenity got pregnant, Zachary had the urge to be with his wife 24/7.
It was Serenity who stopped him from clinging to her.
She had work to do.
Since Serenity was working while pregnant, Zachary had no excuse to skip work. He had to earn money to spend on the baby.
Sonny said it was a boy.
If that were true, then Zachary would have to earn more money for his son to be able to own a house and a car in the future.
Zachary did not lack money. In fact, he could confidently say that