Shop for Genesis
The "What You Need" Set
Lesson Book, Map Book, Workbook, Answer Key
You'll also want one workbook per child. You need at least one workbook, but add another workbook for any child in 3rd grade or higher. You might want to choose a Copywork book for a second grader and a Tracing book for a first grader.
If your OLDEST child is not yet in third grade, consider using the Junior Edition.
Purchase the Lesson Book and the appropriate level workbook for each child.