The Haunted Mansion is dark and contains some mildly frightening scenes, but there is no gore. The ghostly residents are friendly and the ride is slow-moving.
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There are a few jump scares; the most creepy being that involving the axe-weilding bride.
Haunted Mansion can be scary for some toddlers and kids regarding minor jump scares. This doesn't happen until the end of the ride and nothing gets close to your face or your ride vehicle. The graveyard scene is one big party, but the ghosts like to pop up from behind headstones occasionally.
The stretching room is often one of the scariest parts for kids, but you can ask the Cast Members at the entrance to skip it. Otherwise, there is no gore and the ride is slow-moving. We have a full guide on several other things that might scare little ones at WDW.
They're not allowed to intentionally touch or grab you, but just be aware that minor contact (like lightly bumping into you) may happen accidentally, especially in crowded scarezones.