Legal Question in Wills and Trusts in Illinois

Because if your relative wasn't competent when the will was signed, the will's not valid.

What if your relative had decided, while not really remembering you and the rest of the family, that the entire estate should be left to Hillary Clinton? Wouldn't you want competency to be a factor in admitting the will?

The reason is because Illinois law requires it. If there is an attestation clause signed by the witnesses to the will stating that the witnesses believed the testator was of sound mind and under no undue influence at the time of the signing, competency will be presumed.