Neither the balance 3 partners nor the firm is getting the rent from last 3 years . Now he is still continuing without valid agreement. .
How can we do a criminal suit and against whom and what should be pliant.
Default in rental payment shall be a valid ground for termination of tenancy and the tenants are liable to evicted by due process of law.
You can issue a notice to vacate as well as to pay the arrears of rent immediately, failing which an eviction petition or suit can be filed before the rent control court or the civil court as applicable.
An unregistered MOU is not a valid rental or lease agreement, especially in Maharashtra all such agreements are to be registered.
There may not be a criminal case maintainable hence engage a prudent lawyer in this regard and proceed as per his advise on the matter because you have enemies within your own circle in the name of your uncle and his wife.