Zy'ion D'youate McCallum was found around 4:30 a.m. at a home on Potter Street after police received a tip about his location.
"It was joy because I was able to see my child alive, him breathing because really, I did not know where he was or what was going on with him or or what someone could have done to him," the boy's mother, LaTara Robinson, said. "So I'm just happy that he's here."
Police said McCallum went missing Saturday afternoon after Robinson left the child with his grandmother and went to work.
The family said, Robinson's younger teen-aged sister somehow ended up with the child at the DATA terminal in downtown Durham, where she handed the boy off to another woman for a reason still unknown to Robinson.
"All I know is that my sister gave him to them because she wanted to go out and be grown, or whatever the case may be," Robinson said.
The boy was returned to his mother unharmed shortly after he was found at the woman's house almost 48 hours later.
"I want to know who these people were," Robinson said. "I want to actually see them you know, because it looks to me that he was not harmed, that they were actually trying to take care of him."
Authorities said the circumstances surrounding the boy's disappearance are still being investigated and it is unclear whether any charges will be filed at this time.