ChatLicense is available in the app stores worldwide with specific pricing per country.
One subscription is valid for 1 child and 2 parents/guardians. You can use the same subscription with three people and three phones.
Please note: the purchase of the subscription should be made by one of the parents, who will then become the subscription holder and can add their child and the other parent to the subscription.
If you want to purchase a subscription for multiple children at the same time or add an extra child later, that is also possible.