Passwatcher, I miscounted the legatees, sorry about that.  I realized later that I counted only those I had some hope of identifying.  There were actually a total of 15 legatees of Jacob Rhodes.  (I'll copy the group on this to get that on the record.)

Most Rhodes researchers credit Jacob Rhodes with only one son, Dr. Richard Clinton Rhodes.  And one daughter.  As you may already know, Jacob Rhodes' wife Rachel was the daughter of General Richard Clinton, which explains the given name.  I have no idea how Iveys have come up with a Richard Clinton Ivey.  Maybe some confusion about the Rhodes will?  There are some loose business papers relating to Jacob Rhodes in the NC Archives, which I have not looked at.

I might note that Jacob Rhodes mother-in-law, Penelope Clinton, moved to Robeson County after being widowed.  She left a will there in 1814 naming her children and several grandchildren [Book 1, p138] the only Rhodes grandchild named therein being Richard C. Rhodes.

The 1790 census shows Jacob Rhodes as a single man, apparently not yet married to Rachel.  The 1800 census shows Jacob Rhodes with one male 26-45 (himself) and one over 45.  He has one female under 10 (presumably his daughter Sarah), two females 16-26 (one apparently his wife) and one female over 45.  If he were a single man in 1790 then it seems unlikely that any of these other persons are his legitimate children.  They are perhaps servants, employees, or possibly relatives of his wife.  He has 22 slaves.

In 1810 he and his wife have only one other person in the household, one male 10-16, presumably Richard Clinton Rhodes, born ca 1801 according to later censuses.   The daughter had married in 1808.  He is credited with 32 slaves.

The 1820 census shows one male 10-16, two males 26-45, a female 10-16. a female 16-26 and a female 16-45 -- surely only the youngest of whom was his son.  The rest were perhaps servants or employees.  Their absence in the earlier years suggests that they were not legitimate children of his.   He has 38 slaves.  He is the only Rhodes in the 1790-1810 censuses.  In 1820 there is only Jacob and Thomas.

Sarah Townsend mentioned in the will was his only known daughter, married 1808 as "Sarah Rhodes", to Alexander Townsend.

Thomas Rhodes is mysterious.  He is in the 1820 census, aged 26-45, but I didn't find him in 1830.  He may have been a nephew or, more likely, an illegitimate son.  His being given only one dollar in the will suggests he had already been provided for.  However, he was obviously older than Richard C. Rhodes, who received a huge legacy.  That, combined with the census records, suggests to me that Thomas Rhodes was an illegitimate son.

Owen Rhodes, the third Rhodes male mentioned in the will, does not seem to appear in any census anywhere.  He was not a nephew.  He might possibly have been named after Penelope Kenan, Clinton's father.  Owen Kenan contributed his given name to a brother of Rachel Clinton and the name was carried onward through several branches of the Clinton family.  For other Ivey researchers, I might note that Owen Kenan was related by marriage to the wife of Curtis Ivey of Sampson County. (He married a daughter of Thomas Routledge).