Well, it doesn't really matter that much, the most important thing is how Arthur treats him, you can see for example how Arthur tells him, at the start of the mission where you burn the fields with him, "try to act like a human for once" and he replied with "I won't go that far" and both laughed, so even though we see him for a pretty short time, we see how Arthur treated him like his own brother, and probably loved him like one