Not usually. There is a proper for to change a will, with the required witnesses and signatures, absent which the "letter" would be irrelevant.
No because it needs to be signed by the person who wrote the will and they need a lawyer to certify it.
Joan Aiken
Jenna's mother wrote that letter to her .
Lucy Wrote Me a Letter was created in 1993.
amendments
Only after the person who wrote it has died. otherwise, you should not read it unless the author wishes you to do so.
George Washington wrote the first letter i was told by my teacher
The past tense of "Tania writes a letter" is "Tania wrote a letter."
Aedh Wishes for the Clothes of Heaven by William Butler Yeats
I just wrote a letter.
Freud wrote that people have an unconscious drive to die (a death wish). He wrote that this drive is most active in young childhood. Freud also wrote that dreams are the fulfillment of unconscious wishes, and that they often are wishes of early childhood that we have forgotten. Thus, the dream that something is crushing us would be the fulfillment of our unconscious childhood wish to die.
Well... it depends on who wrote the letter. For example, if I had written the letter in 1966.. it wouldn't be worth a plugged nickel!