Are you saying that William Rayner, father of William and George, is also in Tasmania?
Who is Sarah Rayner m.Thomas Kerr 23 Jan 1832 Hbt #1788 RGD 36
No children to this couple in Tas BDM
NSW BDM..children to Thomas Kerr and Sarah
(who might be them..all speculative..but worth noting)
V18324782 121B/1832 KERR Isabella
V18344783 121B/1834 KERR Sarah
V1839705 47/1839 KERR Andrew
V1842273 48/1842 KERR Eliza J
V1844274 48/1844 KERR William G
V18451077 45A/1845 KERR Mary
V18481078 45A/1848 KERR John
V18501079 45A/1850 KERR Robert
and (you would have to think there is a Thomas somewhere to find)
4165/1870 death, Thomas Kerr, Manning River, 60yrs father Andrew, d. Manning River.
3472/1900 death, Sarah Kerr, father William, Stroud.