Title suite or partision suite

Respected gentlemen, Greetings Ananymous & Good Day... I have a serious issue here with regards to a commercial property/business which also had a partnership dead amongst the three family members, respectively 1) Yelder son - Investment partner (solid cash) 2) Third son - investment partner (solid cash) 3) Father of both 1) & 2). - Investment partner ,(land extended as investment as he did not had enough money) Deed of partnership and Deed of Hypothetication made between all three of them. 3rd partner died due to old age/ILL health 2nd partner also died, leaving no legal hurts behind him. Lateron, the first partner , Elder son 3rd partner also died leaving behind a legal hierarchy as his son. Now suddenly, the second son of the partner#3, has occupied the business and land by force and enjoying the same without giving any right or benefits to the son or to the wife of 1st partner(legal hier), My question to all you gentlemen is Can they (the son of 1st partner and wife) get any share in the whole business (business already stopped years ago, only machineries and some stock left) Secondly and main question is: The site/land is 1 acre, which was registered on his (The 3rd partner (Father) ) name. Which he extended/fetched instead of investment amount, which was equal in price to the other two partners share. The second son had a verbal agreement with his father (herein partner no.3) so he paid him cash in hand, as he wasn't interested in this business or partnership either. Sir, now My question to you is, the 2nd son who's currently occupied the whole site/land, including the machinery and business by force, please clarify me, whether he's got any right in this business/land , if so, what would be his share, and what share can we claim from the court for the legal hierarchy of 1st partner (eldest son of 3rd partner), by any means, is there any law in commercial/property/business law where he (family of 1st partner can file for title suite, or how is it going to be??? Please be kind to throw some light on this case, since the legal hiers of 1st partner are facing lot's of financial crises and suffering with hunger and powerty , as the 1st partner has left them nothing behind, for their survival. Thanks a million for your precious time and effort, if you could help me with any advice, that's going to help our survival happily. Please reply to this queries and guide us through your excellent knowledge and experience you gentlemen sir have. My contact number: [deleted] Email: [deleted]