When your child is a cute toddler and in elementary school you are looking for a certain type of guardian and will make your choice based on what your child would need at that stage of their life.
It might be the same one, especially if your children are similar in age, or it might not.
It’s also possible that your guardian’s life circumstances have changed so that it’s just no longer a good fit; a move, poor lifestyle choices, poor relationship choices, substance abuse, other addictions, etc.
Whatever the reason, when you know it’s no longer a fit you should move swiftly and update your will with your new choice.
You should never keep this change a secret. Let the old guardian know as well as any other interested parties.
This way, there is no question about what your wishes were and it reduces the risk of someone challenging your updated will.
Keep your will updated so that it’s always consistent with your objectives and the ever-changing needs of your child.