Gpa

MsX - owner of the property Ms.Y - grand daughter of owner (minor)(mom is d/o owner) Mr.Z - son of owner * In 2007, we (X,Y,Z) had given GPA to mr.A *He didn't use the the power of GPA till 2020 *But Mr.A allowed to build houses without documents + 5 sites were empty *EC, pahani is all in ms.X name *In 2012, mr.Z died *House owners requested us to help to get legal docs *X and Y cancelled GPA at sub registrar without notice *On jul 22, 2021 , we registered the sketched sites to house owners as sale deed + 5 empty sites were registered as relinquished deed to ms.Y and mr.C (husband of X) *Mr.A came to knew about the cancellation of GPA and then *25th jul , mr.X given false complaint abt the GPA cancellation. So, mr.X already knows abt cancellation. *On 30 jul,2021 he registered the GPA to himself *On 2nd aug, 2021, he had given agreement to mr.B 1. Is our cancellation of GPA valid ? 2. Is GPA valid after death of mr.Z ? 3. Is it valid to join minor while giving GPA to others ? If it's invalid how do I cancel ? 4. Can EC , pahani holder sell the property ? Kindly help us what will be the status of this