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Thank you for the additional information.
If your mother and father owned the property as joint tenants then the property became hers, as the surviving joint tenant.
If they are tenants in common, then she owns a one half interest and probate will need to be filed to distribute your late father's interest, which is split between you and your mother. She would then be a 3/4 owner to your 1/4.
If your father's document was a holographic will then it can be enforced if it is entirely in his handwriting and 3 independent witnesses can verify in court it is his handwriting.
Also, where a third party purposely destroyed a document to prevent its enforcement, you can petition the court to admit the copy.