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Assuming you are using SwiftUI, you can follow these steps:

1. Create a model for your data. This model should contain the properties of your child data and conform to Identifiable.

   struct Child: Identifiable {
      let id: String
      let name: String
      let age: Int
   }
   

2. Create an ObservableObject that will hold your child data.

   class ChildViewModel: ObservableObject {
      @Published var children: [Child] = []
   
      init() {
          // Get the currently logged in user UID
          guard let uid = Auth.auth().currentUser?.uid else { return }
   
          // Set up a database reference to the children node for this user
          let ref = Database.database().reference().child("users").child(uid).child("children")
   
          // Listen for child added events and update the children array
          ref.observe(.childAdded) { snapshot in
              if let data = snapshot.value as? [String: Any] {
                  let id = snapshot.key
                  let name = data["name"] as? String ?? "Unknown"
                  let age = data["age"] as? Int ?? 0
                  self.children.append(Child(id: id, name: name, age: age))
              }
          }
      }
   }
   

3. In your sub view, create an instance of the ChildViewModel and use a ForEach to display each child in a list.

   struct ChildListView: View {
      @ObservedObject var viewModel = ChildViewModel()
   
      var body: some View {
          List(viewModel.children) { child in
              Text(child.name)
          }
      }
   }
   

4. Add the ChildListView to your tab view.

   struct MyTabView: View {
      var body: some View {
          TabView {
              ChildListView()
                  .tabItem {
                      Image(systemName: "person.crop.circle")
                      Text("Children")
                  }
          }
      }
   }
   

Make sure you have imported Firebase and FirebaseAuth in your code.