I don't think it was meant to be implied at that point in the game that they meant that literally; [spoiler]children have often been trained to call friends of their parents "uncle" or "aunt" even when they aren't related. It's kind of like how Celes calls Cid "grandfather" in FFVI, even though, seeing how she was genetically engineered, he can't possibly actually be her grandfather.[/spoiler]
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