What is one characteristic that defines William's relationship with his sons?

The characteristic that defines William's relationship with his sons is that he imposes strict discipline. This suggests a dynamic where William emphasizes rules and expectations, shaping his sons' behavior through a structured approach. This type of relationship often involves clear boundaries and consequences for actions, which can lead to a sense of order within the family. The focus on discipline may reflect William's values and parenting style, indicating that he believes in teaching his sons through established guidelines rather than fostering an environment of open dialogue or nurturing engagement.

In contrast, the other options would imply different aspects of parenting styles, such as encouraging open communication, nurturing involvement, or promoting independence, which may not accurately capture the essence of William’s interactions with his sons as indicated by the correct answer.