Reg Partnership Deed as well as Relinquishment Deed

Dear Sir, I hereby propose a legal query as follows, We have an ancestral property in the name of my Grand Father (who has demised in 2000) and his wife demised in 2015, he was survived by his 3 children namely, Point no 1. Elder Son ( my father, who demised in 2008), his wife i.e my mother also demised in 2008, he has 2 children ( myself and my younger brother, both are majors) Ponit no 2. Second Son (Who demised in 2008), his wife is alive and has 2 daughters ( 1 major and 1 minor) Point no 3. Daughter ( Who demised in 2017) Now, as I make the point, the said ancestral property belonged to my Grand Father, hence all the living members of the family executed a partnership deed(registered) in 2013 in 4 schedules namely : Schedule A : My Grandmother (wife of the owner of the property) who was alive then.( was given Rs.2.00 lakhs) as per partnership deed. Schedule B : Myself and my brother representing my father ( point no 1 above, as both my parents had demised) (was given the above said property) as per partnership deed. ( The other 3 schedules had agreed to give/register the above said property in my and my brother's name) Schedule C : Wife of Second Son( Point no 2) said above ( was given Rs.1.00 lakh) as per partnership deed. Schedule D : Daughter of owner of the property (who was also alive then) (was given 2.00 lakhs) as per partnership deed. My question here is, as said above in Point no 2, the Second son of my Grand father (property owner) is survived by his Wife and 2 daughters ( as said earlier, 1 is major and the other is minor) Now that the wife of Second Son has signed on behalf of both her daughters in the Registered Partnership Deed mentioned above in 2013, we have a doubt about her daughters claiming rights over the property as we have not taken any seperate document from them. We also need a clarity regarding the second daughter of Point no 2, who is Minor on date, has any claims on the said property after she attains majority. Myself and my brother (in whose name the property exists, where the names have been changed by the virtue of registered Partnership Deed). now plan to take a Relinquishment Deed from both the daughters of Point no 2 as we do not want to go into any legal complications with them in the future. But the problem with taking the Relinquishment Deed is that one of the daughter's of Point no 2 is a Minor. Kindly suggest us on how to proceed further and secure our property so that the family of Point no 2 does not intervene in any of our matters in the future. Looking forward to your positive solution.