Hi Treehug
When looking for Daniel Tree in the English records, do not include the middle name. Daniel James (born 1852 in SA) was actually the son of Daniel Tree (bap 1798 in Sussex). The SA records have actually mixed this up a bit, which is where the confusion has occurred. According to FamilySearch, a Marian Celia Tree was born to Daniel and Mary Tree - baptised in Bethersden, Kent, in 1817. Daniel Tree and Mary Hodges married a couple of weeks earlier in Bethersden. I think Daniel (b 1798) and Griffess were related through their fathers, who were first cousins. A Daniel Tree witnessed the marriage of Griffiths and Elizabeth, which I assume was most likely this Daniel. It's really unfortunate that none of the records mention the name of the Daniel's wife. It's also possible his first wife died and he married again, then had Adeline and Edwin (both born in the 1830s in England). Or children born between Mary Ann and Adeline died or didn't want to come to Australia.
Hope this helps.
Judy