^^^ On that basis, I know of a lad who could represent Australia (Residency), Hong Kong (or China?) (born there), USA (Mother's Country of birth), New Zealand (Father's Country of Birth), England (Grandmother's Country of Birth), Scotland (Grandfather's Country of Birth), Australia - Again (other Grandmother's Country of Birth) and Ireland (Other Grandfather's Country of Birth).
Good thing he is just a normal kid and unlikely to become the subject of an international bidding war for his signature. Could get messy.
How does it work with adopted kids and the trace back to the Grandparents? Does it follow the birth or adopted lines, or both? A real can of worms.