Query on children of Thomas BURDEN

Thomas Burden, Convict;"Palmyra"; 1846 is on Geni with
* born 1797
* died 1870

married 1817 Mary Ann Burden, {1st wife} (1799-1822)
* 1829 William Burden, Free Settler “Kingston” 1854

married 1822 Elizabeth Burden (1800-1823)
* 1820 Rachel Burden
* 1832 Henry Burden, infant
* 1838 Sarah Jane Burden
* 1844 Alfred Burden
* 1846 Charles Burden
* ? John Edward Burden, Free Settler "Kingston" 1854

married 1837 Francis Burden, {4th wife} (no dates)

married 1860 Catherine Burdon, {5th wife} (1811-?)

Queries
* Rachel was born in 1820 to Elizabeth but in 1820 Thomas was married to Mary
* Henry was born in 1832 to Elizabeth but Elizabeth died in 1823
* Sarah was born in 1838 to Elizabeth but Elizabeth died in 1823
* Alfred was born in 1844 to Elizabeth but Elizabeth died in 1823
* Charles was born in 1846 to Elizabeth but Elizabeth died in 1823
* William was born in 1829 to Mary but Mary died in 1822

Can anyone provide any information on this family?