See also
1. unk DE BOISTERICK, daughter of Alan DE BOISTERICK ( - ), married Robert de Tyrwhitt.
Robert de Tyrwhitt was the son of Robert de Tyrwhitt ( - ) and Agnes (Anne) WYCLIFFE ( - ). He and unk DE BOISTERICK had the following children:
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2. Sir William Tyrwhitt of Ketilby, son of Robert de Tyrwhitt and unk DE BOISTERICK, married unk GROVALE.
unk GROVALE was the daughter of John Grovale of Harpswell ( - ). She and Sir William Tyrwhitt of Ketilby had the following children:
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3. Sir Robert Tyrwhitt of Ketilby, son of Sir William Tyrwhitt of Ketilby and unk GROVALE, was a Sheriff of Yorkshire. He died circa 1451. He married Constance ST. QUINTIN.
Constance ST. QUINTIN was the daughter of Sir Anselm St. Quintin of Brandsburton ( - ). She and Sir Robert Tyrwhitt of Ketilby had the following children:
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