It seems that a GPA was signed by sisters, under ignorance of its legal import, to enable their cousin to transfer the land to his name. The transfer can now be successfully challenged in the court only if the sisters can prove that they signed the document of transfer due to undue influence practiced on them by their cousin. The illiteracy of elder sister is prima facie proof of the fact that the transfer was actuated due to undue influence. So the sisters can file a lawsuit to challenge the transfer of property made by their cousin.