Zachary's parents were divorced three years ago. During the first year after the divorce, Zachary's father visited him every week. Then Zachary's father remarried and fathered another child. Now he rarely visits Zachary. What is this scenario called?

serial fatherhood

Explanation:

Fatherhood is the state of a male parent of in or more children. Serial Fatherhood is a new term in sociology which refers to a divorced father who after developing the second family tends to lose contact with children belongs to his first family. And as time passes father forgets about his first family. as per the question, Zachary's father gradually lost contact with him is an example of serial fatherhood.