You say that your mama was residing in the house, you do not have any proof or evidence for his possession.
Your mother is also not alive to make claim over the pagdi system property.
Neither you are residing in the disputed property either at the time of death of your mama or after that, nor the house property was in your possession.
All these indicate that you cannot make any claim as a legal heir to the deceased tenant, especially when you cannot prove the tenancy of the deceased person also.
The documentary evidences in possession of the rival claimant can be challenged in the court however your case has to be first admitted to be taken on the file of the court, hence you may create some documents to prove that you are the surviving legal heir to the deceased tenant and that you were residing prior to his death and also post his death in the same residence.
All these are necessary o file the case, however these evidences alone may not be sufficient to succeed in the case because the landlord will come to his support in the court of law along with documentary proofs i.e., rental receipts, which will substantially prove his possession and enjoyment of the rented premises.
However you may consult an advocate in the local and work out strategy to confront the situation, if you dont get an assurance then you may decide otherwise.