I think it was implied in the manhwa that winter thinks violet is too weak (when he possessed violet’s body) to bear a child therefore he refused to have one, for violet’s sake.
I think its not that he doesnt want but its because he cant.... Coz of bloodline i forgot what exactly it is but i remember hugo from Lucia when i read that part, that he cant have children until doing some requirements or something
As expected the fight could only be won by the most evil one