Are Usefructory rights ONLY confered in the event of the death of the person that bequeths such? OR …

Are Usefructory rights ONLY confered in the event of the death of the person that bequeths such? OR can one enjoy full usefructory rights whilst the original property owner is still alive?

My Ex wife (in financial difficulty) owns a bonded property and wants me to redeem the bond in exchange for lifelong usage of a granny flat on the property.

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