The two people who sign the Will to confirm that the person making it has signed it. Legally they must be sighted, of sound mind, they must witness the signature together and mustn’t be beneficiaries or married to a beneficiary in the Will. It is also generally advisable to avoid blood relatives of the Testator, regardless of whether they’re mentioned in the Will. This is because a gift (item, money or of residue) to a beneficiary will fail if they or their spouse/Civil Partner witness the Will.