AGPA executed by parties A,B & C together in one document, in favour D, for their own properties. A is owner of Sy no.1, B is owner of Sy No.5, and C is owner of Sy No.10. They all are seperate parties, but executed together AGPA in favour of D. Now D is the AGPA holder. unexpectedly, B died. but D wants sell property of A & C. my question is that, whether AGPA valid or not, view of on death of B.