It's one of these arguments where it depends on what you class as History. It kinda is, in the way that Wesley planned them out this way. But it's then not a translation (again, depends on whether you class a translation as 100% faithful to the original, without any edits), and why should the Gym Leaders get a backsstory anyway (I suppose this one is my own opinion, but I don't care about their stories, you fight them , get a badge, and leave them). Also, why not have a few Gym Leaders who have no connections to anyone? I mean, surely not all gym leaders are related, as it is about skill, not family, and everyone has differences. You've edited them all to have family elsewhere, which is... Weird to me. Again, a difference of opinions.
Ah well, your choice, just saying that it is a matter of opinion, and... Well, it's unimportant, so I don't really care. Just saying that it's why there may be some doubts from others.