The kids can share wishes with their grandparents or others who takes an interest.
Mom and dad can manage the wishlists via the BR app for adults.
The Wishlist app is made with Xamarin.iOS and Xamarin.Android which shares business logic and communication layers.
The UI is made with iOS storyboards and Android XML.
The Wishlist app is closely integrated with a big and complex Web API, but can be used without intenet access since data is aggressively cached.