Hey pankaj !

Different states have different criteria for domicile certificates like some need the candidate to be a  permanent  resident of  that state , some also consider the students who have studied 11 and 12 from that state , some consider the place mentioned in birth certificate etc.

But as much as i know , there is no state which can accept your criteria that if the father has studied for 20 years in MP because it wants the student or the candidate to be a,resident of that place , not the father. So , your son will most probably not be considered as domicile of MP

To know more , you can contact the tehsildar .

Hope it helps!