A man is seeking advice regarding a property dispute involving a will registered by his grandmother 30 years ago, which left a house to him and his sister. He has invested in and paid taxes on the property for decades. However, his paternal uncle has now presented a subsequent will, allegedly in his sister's name, and has influenced a mutation of the property's title to correct a spelling error in the man's name. He is concerned about the implications of this fresh mutation and whether his sister could use the later will to claim the property.