Robert H Young

This ancestor is a mystery to me. I would appreciate any information on this person or his family that someone can offer. I would like a source for your info, but I do not need to have all of your work handed over to me. i would like a legitimate lead that can break down my wall. This is what I know:
The census records show this Robert to be living with the head of household, Robert H Young and his wife Sarah B Young (in Fayette county, TN and then in Ellis county, TX) For a while, I held the possibility that these people may not have been the younger Robert's parents, but perhaps his relatives, Uncle? However, I found the probate papers for the death of Robert H Young, sr that show Sarah B Younge as his wife and that lists the younger Robert as his heir. Sarah swears that Robert is a minor living with her, but I don't recall the document ever stating that Robert is a "son", but the document treats all the supposed children as "heirs" or minors, not sons. At this time, I have no reason to believe that the younger Robert is not the son of the elder Robert.
Robert, jr's sister, Nancy Jane Young (wife of Thomas Jefferson Hines, sr) died in Ellis county, TX and Sarah Holleman is listed as her mother. (Robert died before the county began keeping death records.) I cannot assume that Sarah is also the mother of Robert as Sarah is approx twenty years younger than the elder Robert, her husband.
The younger Robert H Young married Ann Colville Edmondson; they had one child, Medora Elmore Young, my great-grandmother. I found the grave of a Madora Elmore Young near Memphis, TN (very near Fayette county, TN) who died young and is buried in the Elmore plot of Raleigh cemetery. So, we can assume that her maiden name is Elmore and her married name is Young. Could she be the first wife of the elder Robert H Young? (She is not my g-grandmother, but another woman.)
To complicate, I know that the brother to Ann Colville Edmondson to be Elmore Edmondson. How this fits in to the Elmore connection, I don't know.
Because the name Robert Young is so common and that so many are found in the census records, I need something more to connect the senior Robert to his ancestors. The census says he is from South Carolina. One census record in TN shows a James C Holleman living with Robert H and Sarah Young. His age makes him too young to be her father, so I assume James is her brother. Another record shows a Sampson Holleman working on the road crew with Robert H Young in Fayette county, TN.
Ann Colville Edmondson, Robert H Young, jr, Sarah B Young and James T Young and Medora Elmore Young Gueringer are all buried in Myrtle cemetery in Ennis, Ellis, TX (Medora died in San Antonio, TX).
One bio in a history of Ellis County, TX says that Medora and her mother Ann Colville Edmondson Young attended the Presbyterian church in Ellis county before Medora's marriage. Medora's obit shows a Rev. Neely of First Presbyterian church in Ennis officiating at her funeral service. I have not been able to get records from the Presbyterian church(s).
Robert H Young, the younger, and his brothers James T Young and Josiah Hickerson Young all appear on the Confederacy rolls for Ellis county, TX, enrolling near Chambers Creek, TX (where both Robert, the elder, and Robert, the younger, lived and owned property. Other siblings of Robert the younger, not yet mentioned here, are Mary E Young (married to Hines) and John H Young.
I do not know what the "H" stands for in any of the names, except Josiah Hickerson Young. Note, Sarah's name is Holleman. The eldest son is John H Young. If the naming pattern follows tradition, John could be named after his father's father, making his grandfather, John H Young. But, he could be named after his mother's father, making her father John Holleman.
Another bio for the pioneers of Ellis county (Ansearchin' News) says that the father of Robert H Young (who married Ann Edmondson) is a Dr. Young (a medical doctor), but his first name is never mentioned. There is a Dr. John Young in the records of Ellis county. I wonder if the author mistakenly named Robert's older brother, John, as Robert's father.
You might have to draft a tree on paper to follow this family as I have it written here, but any help is appreciated.