Are you talking about the Chinese lanterns in the parent's house? Did you switch from materials to miscellaneous, when looking in your inventory? That's where they should be. Anyway, you have to put them on the marked places in the garden.
You didn't ask any question at all, just stated something with next to no information what you are referring to. We are all players here, nobody can enter your game. If you want help, you should give us a little more to work with.
