1. After executing and registering the partition deed in favour of you and your brother, your grandmother has conveyed the title of the said property to you and your brother,
2. After registering the said Partition deed, she is no more title holder of the property partitioned,
3. So, she can not convey the title of a property or part thereof of which she does not hold the title,
4. Hence, her sell of the said 1 Acre of land to your brother from the already partitioned land of which she was no more the title holder, is illegal and invalid,
5. The registered Partition Deed is valid in the instant case and the sale deed for selling the 1 Acre of already partitioned land is invalid.