But back to the too many kids thing. I once heard a very famous author comment that it was frustrating for him when people asked questions about his older books. "I forget them as soon as I write them," he said. "There's no sense asking me why Bill A. did something in Book Three. At Book Fifteen I might not even recall who Bill A. was."
I have to admit I find it hard sometimes to remember details of my own work. When someone asks, "Why did Susan say that on page 32?" I have to think, "Susan, Susan. Oh, yes. Simon's adopted daughter. Let's see, that would be Book Four... Now why did she say that?"
Most authors "live" in the book they're currently writing, and most of us don't have time to go back and reread or even think about earlier books. The details become fuzzy. The characters' names and personal details won't come to mind.