Bill Bramble was a professional boxer

Bill Bramble was a professional boxer. Why was this a trouble for both Jane Bramble and Bill Bramble?

Undoubtedly, Mr Bramble was a very famous professional boxer and he was very proud of his name and fame. But when Harold was born and started growing up, both his parents were amazed to see his extraordinary academic skills and his overall development.
This became a trouble for both of them because they wanted to hide his father’s profession from their son Harold.