Homeschool Question

I have a question. Let’s start with some info. I am doing distance learning classes for college, and homeschooling my 3 babies. They see me watching lectures online, taking notes, and listening to my textbooks. They don’t understand why their homeschool can’t be more like mine. With there being 3 of them, ages 8, 5, and 3, I would need something free, or the cost would build quickly. Does anyone know of online free teaching sessions for early elementary? Thanks in advance!