Not really, that's not the solution at all. I have no kids standing there and I did the kids mission rescuing the wolf. I left the game for 30 minutes at night and during the day and no kids showed up.
I saw them fighting, so I thought I'm going to help one of them, so I killed both or I killed one and the other die because the other NPC killed him in the same instant I was attacking. Either way I was taking part in the fight.