The Monopoly game is only a simplified investment simulator. And the fact that a child plays the game well will not guarantee a result for him if he does not master the skills of an investor, but perhaps the game will shape the child’s interest in studying finance.
Monopoly might only be better though because as you said it's like an investment simulation so we can still get an idea about it how investing works. If we can maximize it by learning other aspects in investing, there is a big chance that we can be a successful investor. Kudos to the OP for having this kind of idea. It could make things easier for the both of them.