Following on from your suggestion that my 4x great grandfather, Thomas’s (1756) parents were Samuel and Ellin, do you have details that Thomas (1761), Mary Trelfa’s son, moved to Backford, via his children’s marriages/ offspring etc.
If I remember correctly, you had some evidence that most, if not all, of her 9 children baptised in Middlewich moved to Backford, including Thomas.
It’s still a bit surprising that Hannah (born and died 1790) was the last of her 4 children born in Backford as she would have been aged 54! That’s assuming she was born in 1936, 9 years after husband, Ralph Oakes (b. 17/7/1727)- (and I seem to remember Mary’s baptism given as around 1730, St Chad’s, if I remember correctly).
In the 1881 census, the largest concentration of the Oakes name in the UK was centred in Winsford, though this dispersed somewhat by 1981 (I seemed to have lost the link – or it has changed- to the website mapping it out). So, it wouldn’t be surprising if Ralph senior was the one baptised at St Chads (father, John) in 1702.- as suggested by Kiterunner.
So, where does Mary Holland fit in. Sorry, I don’t have any facts, but it’s not unreasonable she came from Backford and married Ralph senior there but lived in Winsford. Why did Mary Trelfa’s family move to Backford in 1776; was it because Ralph senior had passed away and Mary Holland wanted to return to Backford, or was it simply that Ralph junior get a job as church warden, or both (or something else)?