If a couple owns a home and the adult child is caring for them, can a provision be made in their will?

for the adult child to have usufruct rights of the house?   Are is usufruct only for the surviving spouse and  a provisional clause as to the who inherits the house would have to included in the will?

A usufruct is a right by one person over the property of another. It is similar to a life estate in common law jurisdictions, except that a usufruct can last for a specific period of time other than a lifetime. The person who owns the property is known as a naked owner (equivalent to a remainderman in a common law state).

Does anyone know what the laws are in the state of Louisiana?