• How to challenge second will that was prepared under influence

Dear Sirs,
Subject:Place of case is Kota Rajasthan Youngest brother M influenced( under drugs and medicines )mother R and got a second will done cancelling the first will and depriving one brother from the property completely
The details are given as below.
1.My mother R(age at the time of will 86 years)  made a Registered Will on 12/07/2011.She mentioned that this is first and last will.She made beneficiaries to her four sons including 2  grand sons (one grandson of deceased brother ).The names of the beneficiaries are S(son of K), P(grand son of deceased son H),D and M.
The property divided are one house in city given to three brothers or their son namely P,D and M and to S  just a plot in a village in out skirts of Kota city.
Now Second Will was also made and registered cancelling the first will , on 10/04/2012.In this will she deprived of any property to D  citing the grounds of misbehavior within a period of 8-9 months from first will to second will and dividing the house to P and M only.
 Also village plot was  divided in to two parts one to M and other to S.Actually son M kept hostage to mother R and under influence of drugs and medicines and threat. M got the new deed made and registered.
Mother R died on 28/08/2014.
It is interesting to note that son M has done all this to park all valuable portions in his name .This evident from the second will. M took 3  shops in house in city and took portion of the plot where the rental income from the mobile tower is available. It is also important to note that mother was a house wife and kota house was gifted by her father in law( my grand father) and plot in kota out skirts was purchased by my father in the name of my mother R
Since M did all this hiding to any one(still none of the brothers were conveyed to the second will) which will not be tolerated by any one and in a hurry did 3 major mistakes.
1.Ran away from the house because he felt that he will be questioned and scolded for all this by brothers.It is to be noted that the possession of the house is with D.The part on the plot where mobile tower is installed got a new agreement with the tower company which was challenged by S  and rent has been stopped to M.S has also served a notice to tower company to vacate the plot citing the lease agreement for not transferring the rent to the old mothers account which is joint account of mother and S.
2.In just 9 months the period of two wills never cited a single reason for depriving the property to D .
3.In 2011 will there is a clear mention of division and demarcation of ground and first floor along with the architect map where in  the second will made in 2012 there is only a mention of ground floor and clearly missing the mentioning of the first floor .
4. The second will has not been informed to any of the brothers because of the fear and backlash where as the first will was informed to all concerned by the eldest brother (me)
5. It is not out of the place to mention that the brother M who got all this done is  a habitual drinker and because of this his wife remained away from him for ten years and also his daughter is not residing with him 
Now the query is ;
How to implement the first will of 2011 and refrain from acting on the second will for an equitable distribution and also save the property.?
Regards
Kailash Sharma
Dated at Mumbai 17/09/2015