Are you sure that son you are talking about name is Robert and not Robin? Do you know where did he own land and who his parents were? Also do you know if he was a slave and if so do you know who his master was? I'm guessing his master could of been Thomas Christian, Samuel Christian or John Christian Heidelberg. There were the only Heidelberg's that owned slaves except for two widows of a Heidelberg that died. Sorry for all the questions. Any info would be greatly appreciated.