Answer:accession
Explanation:accession means if you own the property you also have the right to anything else that is attached or added to that property or something that is produced through that property. So accession mean your acquired value through something added to your property naturally or through investment.
Example of property ownership through accession
Additional property can be produced through a property in various ways such as when vegetables are grown in your own property land then you have acquired an additional property and you have a right over these produced vegetables since they occur in your property with no discussion according to accession this is yours even if not planted by you because it in your property.
Luke according to accession has added property due to the fact that these boats are in his own property. By default they are his according to a accession.