The term "uncle's law" doesn't refer to a formal legal statute or established legal principle. Instead, it is generally understood in two non-legal senses:
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The husband of one's aunt or uncle: In this usage, it simply describes the relationship between a person and their aunt or uncle's spouse. For example, if your aunt is married, her husband would be your "uncle's law." Similarly, if your uncle is married, his wife would be your "uncle's law." This is simply a descriptive term for a family relationship.
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The uncle of one's spouse: This refers to your spouse's uncle. Again, this is a description of a family connection, not a legal rule.
Therefore, there is no specific legal doctrine or legislation known as "uncle's law." It's more of a familiar term used to describe certain family relationships.
