(1) If a person renounces their right of intestate succession to the benefit of another, it is to be assumed, in case of doubt, that the renunciation is to take effect only in the event that the other becomes an heir.
(2) If a descendant of the testator renounces their right of intestate succession, then it is to be assumed, in case of doubt, that the renunciation is to take effect only to the benefit of the other descendants and the spouse or life partner of the testator.