How to scope a view model to a parent fragment?

So, as per @martin's proposed solution derives that even if One/Many Fragments added as Child inside Parent Fragment, Navigation component provides same Fragment manager to both fragments.

Meaning that even if fragments are added as parent-child hierarchy, they'll share same Fragment manager from Navigation component (might be bug in this library ?) & so that ViewModels are not shared due to this dilemma when using getParentFragment() instance for ViewModelProvider inside child fragment.

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So, one quick solution to share ViewModels would be getting instance of Parent fragment from Fragment manager using below line for both parent & child fragments :

ViewModelProviders.of(getParentFragment()).get(SharedViewModel.class); // using this in both parent amd child fragment would do the trick !

Using Fragment-ktx libr in your app you can get viewModel as below in your app-> build.gradle

 implementation 'androidx.fragment:fragment-ktx:1.1.0'

// get ViewModel in ParentFragment as

 private val viewModel: DemoViewModel by viewModels()

// get same instance of ViewModel in ChildFragment as

 private val viewModel: DemoViewModel by viewModels(
    ownerProducer = { requireParentFragment() }
)

Ok so using this in the parent

model = ViewModelProviders.of(this).get(RequestViewModel.class);

and this in the child

requestViewModel = ViewModelProviders.of(getParentFragment()).get(RequestViewModel.class);

were giving me different hashcodes but the same IDs and it seems to be because of the navigation component, if i change them both to getParentFragment then it works, so i think the component is replacing fragments instead of adding them here, many thanks to @WadeWilson and @JeelVankhede