Theory for the next or soon chapters is the child didn't actually killed his fiance but was framed by someone else probably because of his existence being accepted in a noble family while carrying the blood of barbarian. The child prolly got chased by knights and that's the reason he escaped cause he know if he confess, no one will believe him or get executed immediately if he saw who's the real killer. (If ever this has a novel, please correct me if I'm wrong🙂).
Comment by Wandering Martial Assasin on Bloodhound’s Regression Instinct - Chapter 50
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@Wandering Martial Assasin Something else to consider, even if the youth did do it, there's a difference between a teenager who watched his family burn down and an infant who won't remember anything. The death of the barbarians will be "something that happened", not "something they experienced." Treat the baby with love and give them a warm home, and the death of the barbarians will be weighed against the people the child knows.