@Lala He's the previous Duke's son but he wasn't recognized as legitimate as he's the son of the second wife. (It was explained that the previous Duke didn't want a second wife but was forced to due to the pressure of having an heir since they thought the duchess was infertile cause she wasn't able to get pregnant after a few years of marriage. It was also stated that the previous Duke and Duchess were in love so their son was spoiled and the Second wife bearing a son was a threat to the first son's succession. The only reason why his mother was allowed to carry to term was there was a possibility that the Previous Duchess' child would be born a girl.)
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