1) I have the songs on my iPhone/iPad. I want to unlock them on my other iPad/iPhone too without paying extra. How do I do it?

a) In the other device, log out of the current Apple ID in the App Store.
b) Sign in with the Apple ID which you have used to purchase subscription.
c) Download the KidloLand Nursery Rhymes For Kids app again.
d) Open the app and restore your subscription from the settings screen.
You now have access to all the content. Follow the same steps for more iOS devices."
2) I have purchased the subscription on my iPad or iPhone, can I also use the same on my Android device?

Since Apple and Android have different billing systems, the subscription cannot be shared. If you have taken a subscription on an iOS device, you can use the same Apple ID to restore the subscription on another iOS device, but not on an Android device.
3) How to share a subscription through Family Sharing?

Since the subscription is an in-app purchase, you cannot share it through Family Sharing as Apple does not allow that yet.To make the content available in all of your other Apple devices, follow these steps:
a) In the second device, log out of the current Apple ID in the App Store.
b) Sign in with the Apple ID which you have used to purchase subscription.
c) Download the KidloLand Nursery Rhymes For Kids app again.
d) Open the app and restore your subscription from the settings screen.
You now have access to all the content. Follow the same steps for more iOS devices.