When devise or legacy to witness void.
Section 622
SEC. 622. When devise or legacy to witness void. — If a person attests the execution of a will, to whom or to whose wife or husband, or parent, or child, a beneficial devise, legacy, or interest, of or affecting real or personal estate, is given by such will, such devise, legacy, or interest shall, so far only as concerns such person, or the wife or husband, or parent or child of such person, or anyone claiming under such person or such wife or husband, or parent or child, be void, unless there are three other competent witnesses to such will, and such person so attesting shall be admitted as a witness as if such devise, legacy, or interest had not been made or given. But a mere charge on the real or personal estate of the testator, for the payment of debts, shall not prevent his creditors from being competent witnesses to his will.