Here is the link to find the 6 different lessons that the church has for you to use. During the first lesson, I opened the "FamilySearch - Tree" app and I introduced them to their grandparents. Luckily, I had already posted some pictures of my ancestors awhile ago. If you don't have any images of your ancestors online, it would be great for you to post a couple of them here. You can upload them from your computer and "tag" your ancestor so that when you show your kids the pedigree chart the image shows up. Such an awesome feature!! Here's a link to a video tutorial on how to upload the pictures.
The videos on the lds.org FHE page are great and my kids loved the first one. They got a kick out of the pictures "talking" to them. While discussing the questions posted under Activity #3, I used these worksheets to add to the lesson. There is even a page for your teens to use. Just print and add them to their binders with a plastic sleeve.
Click on the image below to download these FREE worksheets.