Thank you and so glad that I found them again after so many years my friend.
Chameleons only change color when they select a spot to wait for prey.
During their slow walking process, or whenever they are manhandled they won't change color.
As you saw in the post, I found the baby on the grey branches and the baby's color matched the branch that he was sitting on. Very difficult to to see them.
The mother had her usual color as she was walking about.
However if I catch them and put them in a box of any color for a fairly long period, they will change to the color of the box.
But of course I don't want to do that, as they are free little beings.
Blessings!