When teaching multiple students there are different approaches that can be taken:
select the program most suited to the younger child and supplement for the older child, or select the program most suited for the older child and simplify what you use with the younger child, or select a program that falls in the midst of the children's levels and make minor modifications to meet each child's needs, or select complementary core programs which cover the same content at different levels of difficulty; for example, using the Intro to World History, Part 1 (Core 1) with the World History, Part 1 (Core 6) has been very successful for many Sonlight customers.
Whatever approach you use, you would read the Bible, History and Read-Aloud materials in the Core program out loud to the children as a group so that you use your time most effectively and have convenient opportunities to discuss what has been read. One suggestion that may help you in making your choice would be to write out a chart with your childrens' names on one side, and the year across the top. Then look at how each of your options would work over the next few years. There is no one right choice. All choices are valid options! The idea is to choose the program that best meets the needs of your family.
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If you feel a different option in combining children would work better for your family or if we need to customize choices because either child is working above or below grade level in specific subjects, please let us know and we will be happy to assist you in customizing Sonlight for your children.