Hi James
This is quite an elderly post and I'm not sure what your point is exactly. I don't see anything wrong with most of the information here and do not dispute that Samuel Guest married Martha Parker. It is worth noting that in 2009 it was not possible to find online the maiden name of a mother for an early birth certificates - this is quite a recent luxury, so not including it does not suggest poor research methods.
The original question was about Henry Guest born abt. 1811 - the son of Henry and Charlotte Guest who you located in the 1841 census. Samuel was another of their children, although no baptism has been found for him to confirm that.
You say that Samuel's marriage certificate gives his father as Henry Guest, labourer, and you contrast this with Henry Guest, farmer of 50 acres. The latter is Samuel's brother.
As given above:
1851
Cinder Bank
Henry Guest 40 farmer of 50 acres Dudley
Elizabeth ditto 48 ditto
Emma ditto dau 7 ditto
Isaiah Addleton serv 13
Elizabeth Jukes visitor 31
Selina Brooks serv 16 Dudley
This Henry (the one being asked about) married Elizabeth Willetts in 1850 and their marriage certificate says that he is a farmer, residing Cinder Bank, and his father is "Henry Guest labourer" so that fits nicely with the rest of the information (source: Black Country Connections site).
Mary Emma's birth certificate (source: same site) has no first name for her but says "father Henry Guest ...mother Elizabeth Guest formerly Willits ...occup of father Farmer ....signed by Mother E. Guest mother Netherton Hall". So by 1844 Henry was already calling himself a farmer, even though 1841 lists him as a farmer's labourer.
As for Netherton Hall,
https://www.dudley.gov.uk/media/6298/netherton.pdf states "In 1856 the Oxford, Worcester and Wolverhampton Railway was built through Blowers Green. A hall, the residence of John Bradley was taken down at the junction of Peartree Lane and Blowers Green to make way for it.
Netherton Hall fell down a few years later in 1860 due to mining operations in the vicinity."
I don't know how that fits with demolition in 1963-1976, and I have no reason to look into this further.
Any posts made on this site are usually made with the intention of assisting people who are looking at their family history. Some take this more seriously than others, and obviously anyone who wants to be certain of the facts will make an effort to double check everything and look at each source. But that is a personal choice, and we are not all in a position to seek out every document.
This particular family seems to be a typical Black Country Nightmare! The William Henry born in 1833 appears to be Mary Emma's half brother, and his mother was a different Elizabeth.
Have fun with your study :-)