Although Zachary indeed showed favoritism toward his daughter, he was still careful about how he treated Heath. He was afraid Heath would blame his parents and end up disliking Callia.
There were some cases where parents did not realize they had gone too far with their favoritism. They would think they were being fair, but they were already favoring one child over the other.
They never realized they were playing favorites.
Zachary was scared that he was one of those cases. He did not want to