Purchase Agriculture Land on My mother's name

Hi,

My Name is Mitesh and i belong to Gujarat. I am technical buddy and do not possess much of law knowledge. I seek expert's opinion.

The situation is that i want to purchase an agriculture land in Gujarat. I can not directly purchase because i do not belong to farmer family and am not the direct heir of the same. My grandfather (mother's father) owns agriculture land. But when my parents got married, my mother has signed the letter that she does not want any agriculture land from her father. Now the situation is that i want to purchase the land, but i can not do it because no one from out family possesses the agriculture land, not even my mother. Her name from KHEDUTPOTHI (farmer) has been removed when she signed the letter at the time of marriage. My mother has two brother and two sisters.

Can experts in the subject matter advise me what can i do if i want to purchase the land under my mother's name first and then transfer it to mine?

Appreciate a response.

Great Regards,

Mitesh Patel