1. Alan DE BOISTERICK has few details recorded about him.
Alan DE BOISTERICK had the following children:
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2. 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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3. 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:
4 | Sir Robert Tyrwhitt of Ketilby ( -c. 1451). Sir was a Sheriff of Yorkshire. He died circa 1451. |