shlok is not wrong when he fakes illness to stay back with astha at home. The pooja is being done to bring happiness and peace in the agni house. Actually shlok is fulfilling his duty by putting in action what is asked in the prayer. He is doing for his happiness and happiness for all and also for agni family who will get another grandchild in future. As for peace in the family when NA will be kicked out of the house by shlok peace will prevail in the house.