Use the forum search for "blank-slate brain" and train it yourself. Hal is sort of like a child that age, but with a Wordnet vocabulary and a repetoire of thousands of sentences. If you really want to simulate a young child's brain, best to start with an empty database, like a child does. After you get some basic responses trained, turn you granddaughter loose with it, and you'll have a personality capture of a seven-year old in no time, lol.