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Behold Your Little Ones Lesson 21: "Joseph Smith Saw Heavenly Father and Jesus Christ"
First check out the Joseph Smith Home Page that the Church has put together. There are all kinds of basic facts, pictures, and even a "virtual tour."
The following are LDS.org resources unless otherwise stated.
Joseph Smith's First Vision (about 2 1/2 minutes)- Illustrated scripture story
The Restoration (about 20 minutes)- Not one to just sit in watch in nursery but if you had it playing maybe they'd see parts of it or you can watch just a little of it.
Elder Christofferson (about 6 minutes)- Bears his testimony of Joseph Smith and how he saw Heavenly Father and Jesus
Preparation of Joseph Smith: The First Vision (about 2 minutes)- I'd skip the first 20 seconds
Click the image to print. Thanks to Melonheadz for the people graphics.
Scripture Figures- You can use all or just the picture of Joseph Smith and turn them into puppets by attaching a stick. Then give the kids a one liner to say with it like "I know the gospel is true" or something really simple.
Joseph Smith- Poster- you can just use it in your lesson or cut it in pieces and do it as a puzzle together or individually...you can even hide pieces around the classroom for them to find. You could also embellish it with some creativity- bring some cute up pieces of paper or yarn and glue for grass, cotton balls for clouds, etc. Kids love gluing things.
2 Houses Where Joseph Lived- Photos of the houses where Joseph lived...fun to look at then the kids can draw their own home or you can cut these pictures and do something else fun (like make a lift the flap activity with pictures of things Joseph Smith restored underneath the flaps).
Prophet Portrait: Joseph Smith- Use to just look at, sing a song about him while holding it, or do the puzzle thing (you could shrink it down and paste it to Popsicle sticks and each child could have their own puzzle to do).
Joseph Smith and the First Vision- Another poster this one in the grove. You could bring in leaves and glue them on.
Joseph in the Sacred Grove Hidden Pictures- A trickier hidden pictures.
Joseph Smith Story Wheel- I love these but it would be something you would have to do before hand. Make one and use it with your lesson. You could turn it into a necklace but put the string through the same hole as the brand so it will still work right.
Joseph Smith- Prophet of the Restoration- Make this scene to tell the story of the first vision
Joseph Smith Finger Scenes- Lots of fun finger puppets to tell the story
Joseph Smith's First Vision- cutouts to make a scene or puppets