The issue is that you are being cheated by the local agent on some flimsy reasons, instead of verifying the details from a different source you blame the advocates here for not providing you the answer to appease you.
In Maharashtra, only agriculturists can purchase agricultural land. If either of a person's parents or grandparents are agriculturists, then such a person is also entitled to the purchase. If a person holds agricultural land anywhere else in India, he can still be deemed an agriculturist in Maharashtra.
You have mentioned that your mother was holding agricultural land till around 6 moths ago and she sold the same very recently.
Therefore there is no doubt her farmer/agriculturist status.
If you can understand this simple logic and prevailing law you would not have reverted with the same question again
The local agents may tell many tales to fill their pockets so that you being in need of the task to be completed, may oblige by their dictates.
Hence you were advised to clarify the issue from a different and reliable source other than the one who might have misguided you on this.