Oh, for the twins, a line or two a day is probably fine. Most composition programs do very little with kids that young. If they write something every day, it probably doesn't matter much what they write.
And yes, I wouldn't worry a whole lot about the fact that your older DD has some asynchronous development, especially in the area of writing. That's very common. Nothing wrong with being ND for your age! Since you're homeschooling, it shouldn't matter a bit. The grade skip might have made things hairy for her, but at home, it is very easy to serve her needs.
No worries!
