According to what I can determine using Ancestry.com, the parents of Hugh G. Henderson (b. 1797 in North Carolina; died before 1876 in Titus County, Texas) were John Henderson (birth date and birth place unknown--died 1836 in Wayne County, Alabama) and Nancy Maclaurin (or McLaurin, born at an undetermined date in Argyllshire, Scotland, immigrated to North Carolina around 1790, and died 1 June 1841 in Tuscaloosa, Alabama. John and Nancy most probably married around 1790 in North Carolina or perhaps before that in Scotland.
Hugh G. married Mary Box (born 1806 in Madison County, Alabama; died June 1876 in Titus County, Texas), and their children are as follows:
---John T., who married Lucinda Cook (b. 1811): b. 29 Jul 1825 in Fayette County, Alabama; d. 8 Jun 1905, Cason, Morris, Texas
---Nancy Jane Henderson: b. 19 Jul 1828 in Pickens County, Alabama; d. 21 January 1885. Married her first cousin, William Young Box. One of her sons, James Joseph Box, is my great grandfather.
---Michael W.: b. 6 Nov 1830 in Alabama; d. 13 Jun 1881 in Morris County, Texas.
---James: b. 1835 in Alabama
---Johnson: b. 1837 in Mississippi
I've seen the names Mary C. (b. 1840 in Mississippi), Lydia (b. 1843 in Mississippi), and Elizabeth (b. 1845 in Mississippi) associated with this couple, but they don't fit their life dates, and no further data is currently available. I'm not sure of any definition sibling relationship past Michael, who was probably named for his maternal grandfather, Michael Bolton Box.
Ancestry.com traces the Maclaurin ancestry back to a half-brother of Colin MacLaurin, a Scottish mathematician, and to his father, a John MacLaurin, a Church of Scotland minister who translated the Psalms into Gaelic.