Manbu4 is Manbu3's son who IS NOT adopted. Nobody but Manbu3 knows the mother of him. The unknown mother is not here so the job of parenthood is left to Manbu3. This drives him crazy that he has to get up at 5:00 AM to feed him breakfast, drop him off at daycare, go to the coffee shop to work, go and spend his secret time with the Lavawatchers, get Manbu4 and listen to him crying 'till 9:00 PM and eventually fall asleep.