Can my grandfather throw out his son living in forcefully with him?

Mere dadaji ka ghar (flat) he jo mere dadaji ke naam par he. unki age 77 he. Unhe retirement ke baad providend fund mila tha. To ab dadaji ke paas ek makkan he or thoda providend fund he. Mere dadaji ke 2 ladke or 1 ladki he or ye sabhi married he. Mere dadaji ke bade bete ki 2 mahine pahele death ho chuki he. Mere dadaji or unke chhote bete ke bich banti nahi he. Mere chacha ji (dadaji ke chhote bete) unki wife ke saath alag rahene jana chaahte he lekin uske lie wo dadaji se badi ammount demand kar rahe he . Mere dada ji unki financial help karne ke lie taiyaar he lekin wo bahot zyada amount ki demand kar rahe he or wo dadaji ke makaan ke saath saath unke providend fund me se bhi 50% amount ki demand kar rahe he. Mere dadaji ne unse kaha ki wo PF mese kuchh dena nahi chaahte . To ab chachaji or unki wife forcefully gharke ek hisse me rahete he or kisi or ko use nahi karne dete he or jab kahi jana hota he to lock karke jaate he , wo ye room dadaji ko bhi use nahi karne dete. mere dadaji ne unhe ghar se nikal jaane ke lie kaha lekin wo pese liye bina nahi jaaenge esa kahete he . Jab dadaji ne gusse me kuchh bhi dene se mana kar diya to unhone dadaji ko dadaji ke khilaaf bhadkaya or ab dadi ji makaan ka aadha hissa or pf ke aadhe hisse ki demand kar rahi he or dadaji ke saath nahi rahene chaahti. Meri dadi ji Rs 15000/- per month kamaati he or dadaji ko aankho se bahot kam dikhta he to unke paas pension (Rs.1000/- per month) or pf ki chhoti si amount kaahi sahaara he. Mere dadaji , chacha or chachi ko ghar se nikaal dena chaahte or or dadi ji ko apne saath rakhna chaahte he par dadiji taiyaar nahi. Mere dadaji ne police complain bhi ki thi jiise kuchh nai hua. Or meri dadi ne mere dada ji ka gala dabakar maarne ki koshish bhi ki. Please , kuchh guidence dijie jisse ki mere dadaji ki problem solve ho