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Terminal Thomas "Threepenny" Nitt is the father of Agnes Nitt.

He is the third son and clearly intended to be the last (terminal or final) one.  His older brothers are Primal (first) and Medial (middle) the latter just as clearly not intended to be the final child.  Terminal's parents were unusually if not wisely educated by Lancre standards, hence the children's names.  Logically the older brothers should be nicknamed "Penny" and "Tuppeny" in order of birth but whether this is the case is unclear.

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