Is the will considered void due to the illiterate grandfather's failure to sign it, and is the heirs' consent required for its completion?

A will is established by the heirs' acknowledgment of its validity and their acceptance of it, or by evidence proving it. However, if the will is merely a statement without evidence, or written in the testator's handwriting or someone else's, and it was not witnessed or ordered to be executed, then it is not enforceable. The presence or absence of the testator's signature on the will does not affect its validity. Issues of dispute and contention, especially concerning wills, are resolved through the Sharia judiciary or arbitration; a fatwa alone is not sufficient for this, and all parties must be heard.