I wonder, in a View, if there is a way of grouping children to their parents and only one parent per view. I'm guessing that this could be done with arguments, and probably with the use of node Id? But the thing is that I don't know how to do just that. Can someone please help me?

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(parent 1) (Parent 2)...
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|___ Page
| (child)
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|___ Page
(child)