Adverse possession rights

My mother had a property in her own name... and I have two brothers... My younger brother constructed house on this plot in two phases in 1995 and then rest in 2005.In 1995 my elder brother and his wife started living with us... and in intention to encroach the whole property they started fighting frequently with us.. Eventually we sisters and my younger brother got married. Younger brothers wife also started living there.So all family is living there since 1995.. My elder brother and his wife's you're for grabbing the property increased day by day.. they never contribute to any expenses and stayed without paying for anything to my mother till 2016 and did not vacated the room n kitchen they were staying... my mother complained twice thru senior citizen act for this but nothing happened.. then in 2016..looking at her health issues and affectionate care and service from my younger brother my mother gifted this house to my younger brother looking at her health issues.. now my brother has filed the eviction suit to my elder brother to vacate his property but they denied and asking for Rs 60 lacs. And are aiming to claim the property on the basis of adverse possession.. can they claim the part of property on this basis..