In California, can an attorney who drafts a will for their client be a beneficiary?

How do you make a prima facie case for undue influence? In California, when is there a statutory presumption of undue influence? In California, when is there no presumption of undue influence for a donative transfer? What happens if someone fraudulently prevents someone from creating a will? What is an insane delusion? What is fraud in the execution? What is fraud in the inducement? What is required for valid testamentary capacity? What is required to establish fraud? What is undue influence? What relief is available if mistake in the inducement occurs? When assessing undue influence, what is the presumption test? When does a mistake in the execution occur and what is the result?