Definition: Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
Input: Sentence: 'The earliest mention of Jaycocks in Hempstead that I have found William and Thomas Jaycocks , the sons of Francis , who both appear on the 1657 Hempstead cattle census .', Argument/Subject 1: 'thoma', Argument/Subject 2: 'william'
Output:
be son of