Several factors must be present in the execution of a will for it to be legally enforceable. First, the testator must have the awareness and mental capacity to comprehend the nature of the legal construct they are establishing. Secondly, the individual must also be a legal adult and the will must generally be signed in front of witnesses.
Some factors that could render a will invalid is if the testator was coerced into signing the will or only did so under duress. Accordingly, if the testator was deceived or fraudulently influenced to signing the will, the document is unlikely to hold up in court.