Our family tree includes Mittie Jane Robinson born about 1863. Her father was S Robinson born about 1835 and mother C Wilson. I don't have much info about them u fortunately.
There is a lot more on the Manleys. We have a Susan Manley born 1856 to father Willis Manley and mother Martha.
Oral history says that Hambrick left abou 300 of his acres (2000 total?) to his former slaves but the only one on record was his blacksmith former slave Peter Hill.
Then if you follow the census and look at adjacent neighbors of Peter Hill there are a lot of Kennedy's (smtms spelled Canady) and Manley's and I think Crawfords. I'd have to get online to look (typing from phone now)
You mention Thomas Manley is a black male. Are your other relatives from Texas also black? I met another woman through email whose relatives were mixed race and with a love marriage back in the late 1800's in Van Zandt or Smith County.
What is the name of your Robinson relative whom you thought was a Manley?