I feel so bad for him. His aptitude is more like his mother but because he's a guy everyone's expectations is that he MUST be like his father. Treynar might be an asshole but he's a blunt and honest asshole while his parents always go we're strong and perfect, there is no need to change the status quo and assume the same for their son. Sadith, while aware of his troubles and the fact he wasn't really suited for swords, is still a servant and must obey orders. She prioritizes his opinions and desires over hers and will assist in her own weird twisted way