Your Wheat family appears to be in Bell county for a while (1841 to 1845).Your Samuel probably married in Bell Co.You might go to the Bell Co. txgenweb site and pick up additional information.I think Bell county genealogical society also has a web site.The following census will get you back a couple of generations.Sorry, I don't have the 1850 census.It's probably online at the Bell site.
1900 Texas Bell Holland Census 8 Jun 1900 Wheat Frank head w m Aug 1852 47 m TX UnKnown TX farmer " M H wife w f Nov 1855 44 m 7kids 5?living TX Unknown TX " Major son w m Jan 1877 21 s TX TX TX " S Alton son w m Apr 1881 19 s TX TX TX " Otis son w m Jan 1890 10 s TX TX TX
2 Doors down and living with Toff J. C. and wife Nora Wheat Alton boarder w m Apr 1880 19 s TX TX TX
1910 Texas Bell Holland Census Wheat Joe head m w 57 m1 37yrs TX TN TN " Mattie H wife f w 54 m1 37yrs 8kids 6living TX TN TX " Ottis son m w 20 s TX TX TX " Eullen? son m w 13 s TX TX TX
1920 Texas BEll 3-Pct Census 3rd March 1920 Wheat Samuel A head m w 38 m TX TX TX " Mattie wife f w 30 m TX TX TX " Joseph E son m w 4? s TX TX TX " Mervin A son m w 3-3/12 s TX TX TX
1870 Bell Co., TX Census Belton P.O. Wheat Mallitty 52 f w keeping house 1200 200 TN " Isabelle 22 f w TX " Joseph 18 m w TX NEXT DOOR Wheat Sam 31 m w farmer " Anna 25 f w keeping house " Frank 5/12 m w
1860 Bell Co., TX Census Wheat M 45 f farming 3840 TN " Sam 22 m farming AR " Wm 19 m AR " M A 15 f seamstriss AR " Joseph 7 m TX