To use a lost relative document, a player must craft it and right click a villager while holding it. They will then be presented with a list of possible relations to assign that villager.
You can make villagers your Mother/Father, Sister/Brother, Niece/Nephew, Cousin, Grandmother/Grandfather or Great Grandmother/grandfather.
A relation is assigned to that villager by clicking it and then accepting the verification prompt.
A lost relative document is destroyed after being used.
- The lost relative document cannot be used on players children.