Certain subjects - specifically the content/cultural subjects - can be taught using what’s known as the "one-room schoolhouse"; concept. Viz. these subjects can be taught to all of your children (within reason) all at the same time on a single topic per lesson, without holding the eldest child back, or compromising the understanding of the youngest child.
At Love2Learn we group these subjects under the banner, which we call CONTENT STUDIES.
We are intimately aware of the difficulties facing a family trying to teach multiple ages simultaneously. For example, let’s assume you have been blessed with three children. How will you cope if you have to teach three lots of History lessons (all on different topics!), three lots of Geography lessons (yes… all on different topics!), three lots of Biology lessons (again...all on different topics!), three lots of Art lessons (oh no!....all on different topics!)... Need we say more? It is quite likely that you will want to give up homeschooling after a week!
One LEVEL of CONTENT STUDIES can be used to educate students in up to 3 consecutive grade levels simultaneously; viz. all the students in these 3 grade levels will be covering the same material at the same time, however their output will be different.
(See: How To Choose Your Subjects)