Here is a good example of "grandfathering:" You own a store in a small town. The store has a very big sign in front of it. As the town grows, the town government passes laws that are designed to keep the town beautiful. One of those laws says that you can't have a big sign in front of your business. Because your sign was in place before the law was passed, it is said to be "grandfathered" and is still allowed. Only new signs must conform to the new law.
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