His haircut seems to be a close buzzcut as shown in "Hanks Bad Hair Day". Despite differences, Bobby and Hank's relationship is close and Bobby considers his father to be his hero. If Bill is Bobby's father, it would have caused a lot of stress between him and Peggy.
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Please consider expanding the lead to provide an accessible overview of all important aspects of the article. What about that time Bill passed on his secret "family recipe? Despite differences, Hank and Bobby have a close relationship.