1)memorandum of family arrangement does not require registration . it merely records understanding arrived at between brothers
2)if there is division of property deed of family settlement is required to be registered
3) deed of partition is required to be stamped and regsitered
4)you can challenge the partition as it is not registered and is inadmissible in evidence
5) on demise of daughter of uncle property can be mutated in favour of her children as legal heirs
6) file suit for partition seek injunction restraining sale of land by cousin sisters son