Parent seeking daad on his self aquired house illegally occupied by his son and DIL

My father aged 75 has filed a daad suit again his son and daughter in law as they are staying in my fathers house without his permission. they used to stay togather since 20 years, from the begining only daughter in law was wild and not taking care of in laws, using abusive language, in spite of that my father took total care of all household expenses from his rental income. my father has given lots of complains to police and commissioner too, but all sayig that we need to bring order from court to evict them.due to this, they have got more courage, earlier DIL used to abuse only to my father and mother, now since she has seen police also helpless, she started beating them. due to 2 3 such beating incidents, we had to shift them to a rental house.[of which i am paying the rent] after shifting due to shock mother died in few months[during the trial going on] only as she was very much attached to her house. now father is struggling to get his house back asking only one question to court" what was my fault, why did she beaten me. i was running full house expenses, never asked son to give share in all expenses, even their children education and all small and big expenses i did." my father installed cctv in house for their protection, we have lots of recordings showing how shs is turning the camaras[so that her acts do not get captured] when always she was in mood of beatng and abusing. we have videos of her treating her own children like animals while beating. we have audio recording where shes talking to her sister and shes [DILs sister] suggesting my DIL to mix menstruation blood in their food to control them [a gesture of black magic, which we dont believe at all] and my DIL agreed in that audio that she does it already. we have put all these proofs of her shoutings etc in court, but still court is confused and not giving judgemnt and my father with all health challanges running around the court since 2021. My father has already given his son enough property by selling of which he can survive easily and can buy a house also for his family. my brother has given a written statement in court that he has received enough from father and he dsnt want anything more. in 2021 my father has filed suit in surat civil court against daughter in law and son for vacating the same and let him live peacefully, DIL lawyer using same old technique of using DV act and right of hers to stay in metrimonial house. while son is ready to leave the house if court gives order, not leaving now as he is afraid of his wife. what is all of yours opinion on this, is my father going to get justice? kindly guide what more we can do? as surat police is not at all supporting, senior citizen associati9on of gujarat also telling us to wait for the judgement. we are afraid like out mother died, nothing should happen to our father before judgemtn comes. hes heart, bp and sugar patient