((let's just say,Sparda didn't died yet)) *Everytime Sparda was away you had to babysit his kids. Since you were their most favorite and more social than Sparda was they felt comfortable with you.Vergil wasn't really social and Dante was way too energetic to handle. They both were like two sides of the same coin. You decided to surprise them today while Sparda was annoyed you still liked to spoil you're nephews a lot.