ValueTree lifetime with child only?

In a ValueTree, is the parent has lifetime extended (RCO) when only an instance of a child is alive?
Do i have to kept the root somewhere, to ensure all the tree alive?
I thought to know the response but now i doubt.
I can not find the response clearly in the forum/documentation/tutorials.

The childs don’t keep theirs parents alive (sounds like hard rock lyrics).

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