Firstly, the document of sale deed is in your mother name as you stated in the above mentioned query, which is sufficient for filing the suit for eviction in court of law.
Secondly, there is no need to bring the previous chain of property ownership.
Thirdly, you can file on your name also as the representative powers.
Thirdly, first you need to go to the rent controller then to the appellate forum then to the High Court.
It is not clear from your query as where have you gone till now.