Advice needed: eviction, DV risk & Will/Trust planning

My father purchased a house from his mother through a registered sale deed, so it is his self-acquired property. My wife (daughter-in-law) is staying there and claims she cannot be evicted as I am her husband. There is marital discord and risk of DV/498A cases. My father intends to execute a registered Will or trust in favour of my minor autistic son (his grandson). My wife is the step-mother of the child. I will be the natural guardian, with my mother/sisters as alternate guardians. I seek advice on: Whether my father can legally issue a notice to evict my wife and the safest procedure in Kolkata. Whether eviction can proceed if DV/498A is filed. Whether trust is preferable to a simple Will for an autistic child. After my father’s death, can my wife claim residence in the property willed/trusted to the child. My right to stay only as guardian, and whether that gives any right to my wife.