Legal Question in Wills and Trusts in California

Not necessarily. If it is a formal will, you need two witnesses to sign and notorized. If it is a holographic will, you do not even need notary. Depends on the nature of the statement. It must be evaluated by an estate attorney in terms of intent, capacity, and formality of the statement, among other things, before it can be offered as a valid will.

If you do not have any witnesses, they it can not act as a holographic Will as the notary stamp is not handwritten and is not in the person's own handwriting.

No.