Hi, William Wagg married Mary Reeve in 1800 at Runcton Holme, Norfolk. England They had five children:
Robert Wagg b.1801 d.1885 London changed his surname to Waigh c1840
George Wagg b.1803 d.1892 Australia
Sarah Wagg b.1805 d.1852 Newmarket England
William Wagg b.1807 d.1887 Australia
James Wagg b.1810 d.1810 Stow Bardolph, Norfolk
Mary Wagg died in child birth 1810
William remarried Mary Pleasants in 1812 Stow Bardolph,Norfolk.
I have more information on the children of William and Mary if you need any help please let me know.