Thomas's parents and siblings according to the IGI's appear to be......
JOSIAH GRANTHAM (born 1787 Quainton, Bucks, died 1844) & SARAH COLES.....they married at Quainton, Doddishall, Bucks on the 13th July 1807
children......
JAMES GRANTHAM .....B. 11TH NOV 1806 DODDERSHALL, BUCKS...parents JOSIAH GRANTHAM & SARAH COLES
----------------
WILLIAM GRANTHAM....B/C 1808 ST MARYLEBONE....parents JOSIAH GRANTHAM & SARAH COLES
----------------
CHARLES GRANTHAM.....B/C 1812 ST MARYLEBONE...D.1838.....parents JOSIAH & SARAH GRANTHAM
----------------
JOHN GRANTHAM........B 1810 ST MARYLEBONE....parents JOSIAH GRANTHAM & SARAH COLES
----------------
JOSIAH GRANTHAM....B/C 1814 ST MARYLEBONE...parents JOSIAH & SARAH GRANTHAM
----------------
GEORGE GRANTHAM....B.1815...C.1816 ST MARYLEBONE....parents JOSIAH & SARAH GRANTHAM
----------------
SARAH SOPHIA GRANTHAM....B/C 1817 ST MARYLEBONE....parents JOSIAH & SARAH GRANTHAM
----------------
ROBERT GRANTHAM...B/C 1819 ST MARYLEBONE....parents JOSIAH & SARAH GRANTHAM
----------------
ELIZABETH GRANTHAM...B/C 1821 ST MARYLEBONE......D.1890....parents JOSIAH GRANTHAM & SARAH COLES
----------------
THOMAS GRANTHAM....B.1823 ST MARYLEBONE...D. 1905....parents JOSIAH & SARAH GRANTHAM
----------------