Will

After my grandmother died my uncle got an affidavit signed by my mum to transfer his name to khata, stating that they were legal heirs & now my mother is transferring khata to my Uncles name. My uncle also signed an affidavit stating that both him and my mum are sole legal heirs to the property and that (his sister) my mother has no objecting in transferring khata in my Uncles name. My uncle died and his wife transferred the khata to her name again by way of affidavit from my mother. Since my mother was in another town she consented to khata transfer to take care of property on her behalf too. However, when my Uncles wife wanted to see the property she had no choice but to convince my mother to sign a "special power of Attorney " to relinquish her rights. My mother never signed the document. It was at this time we got to know the my grandmother (supposedly) had drawn out a WILL in favour of my uncle. My mother filed a partition suit & unfortunately we lost the case because my lawyer failed to contest the WILL despite having a witness alive & suffering from parkisons. The court sent it own lawyer to get testimony from the witness but could not understand anything the witness said. The witness son came to court to identify his father's signature. Question: is my case good for an appeal. Can I appeal on the affidavits despite having [the so called] WILL. If the WILL existed as claimed, would they have still required the affidavits? Can my Uncles affidavit stating he & my mother are sole legal heirs be contested. Your advice is much appreciated. Thank you.