An heirloom is an ornament or other object that has belonged to a family for a very long time and that has been handed down from one generation to another. a valuable object that has been owned by a family for many years and that is passed from the older members to the younger members (heir + loom (10-19 centuries))
Any furniture, movable, or personal chattel, which by law or special custom descends to the heir along with the inheritance; any piece of personal property that has been in a family for several generations
something that has been in a family for generations (law) any property that is considered by law or custom as inseparable from an inheritance is inherited with that inheritance