Curse of InniStrahd
Rose and Thorn Durst
Young children who invite the PCs into the House
Rose and Thorn are two young children who invited the PCs into the house to investigate the monster in the basement
In reality, the children who initially meet the PCs are illusions created by the house.
The real children are geists in the attic. They were starved to death after being locked in the attic by their parents. They help inform the PCs on how to get into the basement.
The PC’s put the children’s spirits to rest after placing their bones in the house’s crypts.