Marriage and issue
He married Ada de Balliol, ca. 1218, daughter of Hugh de Balliol and Cecily de Fontaines. His son Roger FitzJohn, Lord of Warkworth, married Isabel de Dunbar daughter of Patrick II, Earl of Dunbar. His daughter Cecily married Patrick III, Earl of Dunbar.
- Richardson, Douglas, Magna Carta Ancestry, Baltimore, 2011: 492
- "Fitz Eustace". Retrieved October 29, 2009.
- "ANCESTORS OF REED MOLTHAN WILLIAMS WURTS". 27 October 1998. Retrieved October 29, 2009.
- Weis, Fredk., Lewis, Th.D., et al., The Magna Charta Sureties 1215, 5th edition, Baltimore, 1999: 63
- Richardson, Douglas, Magna Carta Ancestry, Baltimore, 2005: 210
- https://histfam.familysearch.org//getperson.php?personID=I24516&tree=EuropeRoyalNobleHous. Retrieved 13 May 2014. Missing or empty
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