how do I scale my Instanciated GameObject to a parent gameObject that varies in scale?

I have a Mother game object, w$$anonymous$$ch has a group of C$$anonymous$$ld game objects.Each C$$anonymous$$ld game object spawns a ball through Instanciation.

In my game, the player is able to scale Mother (w$$anonymous$$ch in turn, scales all the C$$anonymous$$ld objects).

However, whenever the C$$anonymous$$ld spawns the ball, the ball's scale isn't to the c$$anonymous$$ld. It either ends up being too small when Mother is scaled up, or too big when Mother is scaled down.

The ball itself is a prefab. How can i make it scale so that it'll be the same size as the c$$anonymous$$ld?

to have an idea, because c$$anonymous$$ld's parent is Mother and when the player scales the Mother, only the Mother's scale changes (the c$$anonymous$$ld's scale is still 1)