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Either way is fine, but mostly I see ancestors at the top when people discuss their family tree. Depends whether you want an ascendent or descendant tree.

Ascendant trees (tree goes upwards) put...

I love the way you put the Grandparents at the roots, and on up to the children at the top.

I don't think that's the case - the grandparents are at the top. It's an inverted tree of descendants.
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