Definition
MILandFILare used to refer to the parents of the SIL's partner. SIL may also stand for "sister-in-law" so the context in which the acronym is used will indicate if it is referring to "son" or "sister."
Origin
slang.net
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See “SIL” in Corporate Speak, Gen-Z Slang, Pirate Speak, and more.
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