Thanks Monica. Yes those are George Jnrs details. There is no birth record for him, that I can locate, but that is his death record.
There are a few family trees on ancestry - all with different parents! So I don't think any of them are necessarily accurate. So, for example the one you gave the link to, the death record for that George with parents George and Margaret Adam, only lists Jane Todd as his wife. There is a marriage record for George marrying Jane Todd in 1843. But no children, unlike the Mary Jane Todd listed in that tree.
The list on Bayanne has Barbara Gordon being born in 1805. But there were quite a few Barbara Gordon's born around the time and I can't find anything that verifies that this is the same Barbara Gordon.
There were also a few George Brechin/Brichens, so it is hard to work out who is whom. But the death record for George Junior lists his father as a land steward. Could a land steward be the same as an overseer? What about a Master Gardener?
There are 2 census records in 1841 for a George Brechin aged 12. One is the one living at Turner Hall. The other is living in a large house as a male servant. Either way, the mother was not around so I suspect Barbara Gordon may have died in 1840 or earlier.
So I think it is still a tangled web at this stage, and I can't rely on those other trees. But I have hope that I will find more evidence and will untangle the web.