wix React-Native-Navigation: Would a parent screen on the stack ever be unmounted while user is viewing the child screen?

Question

I’m using wix react-native-navigation with bottom tabs.

If i navigated to a screen say 2 levels deep from one of the root tabs (i.e. pushed two screens on the stack) so:

E.g. RootTab_Screen1 -> ChildScreen2 -> Grandchild_Screen3

While I'm viewing GrandChild_Screen3, could either ChildScreen2 or RootTab_Screen1 ever be unmounted - if I don’t navigate away from this grandchild screen?

More specifically, if I passed a function from ChildScreen2 to Grandchild_Screen3, would ChildScreen2 be always there to respond to calling the function?

Thanks for your help.