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Clearly we have different sources for information regarding Heirloom seeds and plants but instead of arguing the point with you any more, I simply invite you to read anything you can find written by Thomas Jefferson on gardening. Some of his journals are a great read and very insightful into many varieties people consider "heirloom" today. He used to plant his melons, cucumbers and squashes altogether just to get the seed to cross pollinate so he could spoof his gardening friends by giving them the seeds to grow to see what would come out of it. Luckily, his gardening pals were quite amused by it and took great delight in finding out what they would get. In his generation, most people didn't even have different names for seed varieties and they got what they got from whoever had seed for something. It wasn't until the advent of using seed "catalogs" that names were given to different plant types but even then it wasn't until 1940's or after that the names were even remotely standardized across all the companies. Different places called the same seed by different names almost as a rule. So tell me, please, how you know that your seed for Brandywine tomatoes that are considered an heirloom are actually what were originally called Brandywine tomatoes? There is no government agency that regulates seed names or products, and even if there were, now, it wouldn't make a difference to what has been done in the past. Heirlooms really aren't that big of a deal to get worked up over.
Just grow what you like and what works for you in your environment. That's what our ancestors did.