Hi,
Here is what we have.
Taking your original question and adding notes in square brackets [like this].
- Mold Marriage, April 14 1854.
Robert Woodward. Full Age. Joiner. Hendre Biffa. Father John. Joiner.
Harriet Roberts.Full Age. Hendre Biffa. Father, David. Lobourer
[This is correct. This is Robert Woodward born 1829.. Harriet was born 1830.]
[Robert's father was John Woodward b:1791. His mother: Elizabeth Jones]
- 1871 [also 1841 and 1881 census]
Adam Woodward abt 1867 Mold, Flintshire, Wales Son Nercwys Flintshire [correct]
Daniel Woodward abt 1862 Mold, Flintshire, Wales Son Nercwys Flintshire [correct]
David Woodward abt 1855 Mold, Flintshire, Wales Son Nercwys Flintshire [correct]
Elizabeth Woodward abt 1864 Mold, Flintshire, Wales Daughter Nercwys Flintshire [correct]
Harriet Woodward abt 1830 Mold, Flintshire, Wales Wife Nercwys Flintshire [mother, see marriage above]
Jane Woodward abt 1858 Mold, Flintshire, Wales Daughter Nercwys Flintshire [correct]
John Woodward abt 1850 Mold, Flintshire, Wales Son Nercwys Flintshire [see note below]
Robert Woodward abt 1829 Mold, Flintshire, Wales Head Nercwys Flintshire [father see marriage above]
Robert Woodward abt 1857 Mold, Flintshire, Wales Son Nercwys Flintshire [correct. he married Jemima Roberts b:5 mar 1857 m:27 Dec 1879] [ my wife is from this line]
Living at Castell, Nerquis. Robert a carpenter.
Have got all their details in 1881, 1891 and 1901.
Robert Snr died in 1916 and Harriet in 1918 both in Nercwys (present day spelling)
[I have Robert snr as having died 21 April 1913. This taken from his gravestone. Harriet is also burried in same grame d:7 Sept 1915. I can send you picture]
[I do not know where they were or why missed in the 1861 census]
[Now John b:1850 was already 4 years old when they got married. Normally this was a scandal at the time. However, one explanation is that John was adopted. There were many accidents on the mine and there are family stories about these involving the Woodwards. Possibly, John was an orphan from one of these accidents and was adopted.]
As mentioned, my wife comes from Robert Woodward b:1857 as shown above. So there are two Robert Woodwards in her line. From which line is your family?