There are quite a few trees for the Sutely family in South Australia on ancestry.com.
There is conflicting dates of birth for Joseph Francis and John Henry and Emma Susannah.
On Trove newspapers there is Sarah Ann and her younger sister Emma appear as witnesses in a criminal case in 1844.
http://trove.nla.gov.au/newspaper
Do you have the record of them arriving in 1840 on the ship Royal Admiral?
This is what i have on them
Joseph Andrew Stutley = Charlotte Ann Chaney
b. abt 1796 B. 4/12/1797 Bapt 14/1/1798 Rochester, Kent
married c1822 Canterbury
1) Joseph Francis b. c1822 (no bapts) = Mary Collins
2) John Henry b. 30/5/1823 Bapt 27/6/1823 = Edna Higgins
3) Sarah Ann b.10/12/1825 Bapt 1/1/1826 = John Thomas Dyke
4) Susanna b. ? abt 1826 Bapt 25/1/1829
5) Emma Susanna b. 27/7/1830 Bapt 8/8/1830 = ?
Family all arrived with the exception of Susanna from Canterbury, Kent to South Australia on 10th Jun 1840 on the Royal Admiral