I'm late to the party, but my advice might help someone.
Dont' force a child to sit and program.
Design with them using psuedo code and acting/talking out the gameplay.
Take whatever toys you step on normally and put them in a box(yourwindow), simulate with whats you have on hand in 3D real time.
Do all the pre production and research and collecting screenshots and sound effects that you need for the code.
Its exhausting, take turns, take breaks.
Then work out the code yourself, then teach your kid to code what you know how to code.
Ok ready?
The simplest game is one that answers questions from given input.
Psuedo code since I don't know EGSL yet:
playersName = ""
playersQuestion = ""
computersQuestion=""
computersAnswer=""
This could be simpler but this should keep things clear to a 9 year old.
print "what is your name"
input playersName
print "What is your a question for me ".. playersName
now, you could do two things if you absolutely must have your kids picture in the game.
The childs image could be the questioning authority, instead of a cold dark terminal like Eliza.
Or you could have their picture pop up whenever their name is used, by accessing files, however
thats done with your particular coding software.
Back to software, we ask for a users question, but we dont' really care about the content at this level.
input computersQuestion
random number from 0 to 1
if the number is 0 then the computersAnswer is false
if the number is 1 then the computersAnswer is true
BASIC stuff right?
Now you have all kinds of options to handle this, computer can say true/false, or something "I'm sorry Dave, I can't do that", or "I feel confident of the outcome"
From there you make more than one option per true, false roll.
Then work on cutting the users input to reuse in the output.
The whole exercise is to learn programming and make this program as close to Cleverbot within the level of ones growing knowledge.
Revisiting this simple program can teach you the basics of any language, as you try to make it more intelligent, relavent, witty, or whatever need.
A natural progression from this is magic 8 ball, tarot deck of implied fortune and fate, a psuedo psychologist, positive affirmation widget, a text adventure of choose your epic avenues.
For the serious minded this basic course of game making is a foundation for any typical web page asking for input and offering the user things based on that input...ie Amazon or Apple or whoever.