How to prove a will

If the will was executed properly by following legal manner that property would be distributed in accordance with the will. For your information, will need not be registered in the eyes of law. In the absence of two witness, In the absence of both witnesses and self-proving affidavits, particularly if someone may want to contest the Will, it may be necessary to demonstrate to the judge that the signatures of the person who made the Will, and those of the witnesses, are genuine. That can increase legal expenses, require handwriting experts, and added to a family’s grief after a death

Will is valid if (1) it is in proper form, (2) it was signed by the person making the Will, (3), the person was an adult of sound mind, free from “undue influence,” coercion, fraud or mistake, and (4) it was properly witnessed by the required number of witnesses.

A Will that was valid when made remains valid, even if the person making the Will later becomes incompetent, or the witnesses should die. However, after the person’s death, the heirs who are seeking to have the Will admitted to probate have to produce some proof that the Will was properly signed and that’s where the witnesses come in. If the witnesses are unavailable, it can lead to delays and added expense for the heirs and the executor.

To anticipate the potential problems, “self-proving affidavits” are often used. They are statements signed by each of the witnesses under penalty of perjury, generally right after the Will is executed and witnessed, that the person making the Will did, in fact, sign it, appeared to be of sound mind, and was signing the Will freely. (In some states such statements must be signed before a notary public.) Your witnesses won’t have to testify as to your will’s validity when you die, for the affidavit speaks to the will’s validity and serves as extra insurance that they witnessed your signature. This “Self-Proving” Affidavit also avoids problems that may arise if the witnesses cannot be located.
Sources: https://law.freeadvice.com/estate_planning/wills/what-if-will-witness-dies.htm#ixzz3fD9BAHiQ