@Playalot The two pictured here got common elements from the elements collection
Had another sim age from Young Adult to Adult, and they got various collectables from their great grandparents, siblings, step siblings and aunts and uncles long since dead (it's a long and complicated dynasty the confuses me sometimes).
Edit: Had Young Adult to Adult and Adult to Elder birthdays and the Young Adult to Adult got a set of 4 plates from great great grandparents, an aunt and an uncle.
The Adult to Elder got a mix of plants, elements, sugar skulls and something else from another collection from just about every deceased member of their family/extended family no matter how long since they died or if they even knew them when they were alive.