Elwyn: Do you know if these records are online? If not, you couldn't do a search for me? I live in NZ, a long way away from Magherafelt!
Aghadowey: Margaret Richardson is the married name of the child who stayed in Ireland, so I suspect that this Robert may be a nephew of my ancestor. Just reading the ebook.
Thanks for the help, they were certainly Presbyterian, that much is family knowledge.
Note: Based on the names of Robert's brothers and Robert's sons' names, I'm guessing that Robert's father may be Samuel Steele and Robert his eldest son. Any matches for a Samuel Steele, married around 1807, born c. 1787? Of course, this is just guesswork, but it might help.