Relinquishment deed : protect against future litigations

Background 1. We are 4 brothers. I am the youngest.Our late father, about 12 years ago, willed that an independent house (constructed out of his own savings ) be divided into 3 shares. 25% each to two brothers and 50% to third brother. 2. I have been excluded by mutual agreement , since the brother who has 50% share had paid me money by cheque for the value of my share (All white, it is declared in my IT return ). This happened with blessings of my father and is mentioned in the will along with details of how much was paid and by whom for the share of my property. Will makes it clear that because of this arrangement, I have not been given anything. 3. The property is in Hyderabad city limits. I am permanently settled in Bangalore. 4. Father’s will was not registered or probated but about an year ago a partition deed (metes and bounds) was made amongst the three brothers, registered and most likely mutation is also carried out. 5. I did not sign the partition deed as witness nor was any consent document given by me because they wanted to link my consent to include details of my self acquired property and I refused to do so. However I made it clear to them that they can proceed as they wish and to reassure them given my brothers an undertaking (on a normal paper, signed ) that neither me nor my son has any right or claim to it to remove any doubts. 6. Two of my brothers have been separated from their families (not legally) for more than 20 years now and relations are very strained. One sister in law also filed a court case against her husband many years ago to stake a claim to his retirement benefits (case settled). 7. One of my brothers is terminally ill and needs money for expensive surgery so they are thinking of giving the property for development. 8. Builder’s lawyer advised them that I should give a relinquishment deed or sign the development deed with a clause saying that I have no stake in development proceeds. He also advised them that this document will help them dispose the property easily, 9. I have no financial interest in this matter and wish to help them but I DO NOT WANT TO BE INVOLVED IN ANY LEGAL DISPUTES OR BECOME A PARTY IN LEGAL AFFAIRS ( It is 100% likely that a case will be filed by the separted sister’s-in-law or their children (all adults). THIS is the main reason I am asking here Questions 1. Since partition deed is done and probably mutation also, is there any requirement of me signing this relinquishment deed ( I asked for a draft of it) ? 2. In the interest of helping them I am willing to sign but in my opinion a separate deed is better than being a part of sale deed (since it is 100% likely that a case will be filed) and I DO NOT want to be a party to any legal issue. Is my understanding right? 3. What should I include in the deed language so that my interests are fully protected. 4. Should I consult a local lawyer in Bangalore or in Hyderabad? Are laws dependent on location?