William FitzWilliam & Ela Warren 
They had a son named Thomas.
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Children
Thomas FitzWilliam
Thomas was born in 1195 in Sprotbrough, Doncaster, Yorkshire, England.2 He died at the age of 47 in 1242 in Royton, England.2
1 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=stolp&id=I3895&style=TABLE
2 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=stolp&id=I6095&style=TABLE
2 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=stolp&id=I6095&style=TABLE