My 4yr old girl and 2yr old boy are quite stubborn and impatient. When they want something and immediately but could not get it, sometimes will throw tantrum. We don't give in all the times. Have ask them to wait patiently as we are busy, count to 50 method, explain to them method, etc. Soft approach don't work sometimes use hard approach. How to train them to be patient and not too stubborn?