Who would they move a kid around when there was a place (the help center) everyone would go to if they lost their kid. The mom is gonna realize that the kids missing and go straight there unless she doesn't notice her kid is missing which is supes unlikely. So why would you walk around and make it harder for the mom to find the kid hnghhhhhhhhhhhhhhh. Mangaka could still have made it so them 3 still held hands at the help center if he made them look for the mom to set up the hand holding scene.