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I still think it's a longshot. Are all the kids around the same age? That might improve the odds, but still there are a lot of school-age kids to pick from. It might be a better chance then winning the lottery, but it's still a bet I would make.
If it was in someplace like Coober Pedy, that might be considered a small city. But I've been to places where you know everyone because there are less than 100 people in the city. That's what I would consider to be small. Adelaide is pretty spread out too, with lots of suburbs and other people they could meet.
An even if they did meet, hook-up (with the opposite gender), and have a kid, they are still just half-siblings. They would only have one Grandpa, but I don't believe the genetics are as effected. But I could be wrong on that.
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