Attempted to email u but unsuccessful. Have marriage cert. of Donald and Jane (Kos was witness) and death certs. of Kos and Sarah Ann. Checked with LDS and they have some details of Sarah, born 1810 etc. (different to her death cert.)and name Elizabeth Batchelor as mother of Kos. Followed Sarah Elizabeth and Thomas Leeder but unfortunately their only grandchild died. Also from St Peters Cooks River historical society have lists of baptisms, burials, etc. and the publication "Grave Reflections" story of same.