1851 if not already found;
Barking, Essex
Thomas Sullinger, 66, Head, Mar, Fisherman, born Hornchurch, Essex
Mary Sullinger, 61, Wife, Mar, born Lopham, Norfolk
George Sullins, 28, Son, Unm, Blacksmith, born Barking, Essex
Baptisms Barking;
MARY ANNE Sullinge 21 Feb 1810
GEORGE THOMAS Sullinge 02 Feb 1823
(FreeREG)
A Tree has Mary as nee GAGE married 1820 Essex but the entry is on FreeREG and they were Bachelor/Spinster.
So not likely as Mary Ann born 1810