"I'm glad the child told on his parents - that's what they get!" said Derrick Tucker, who lives across the hall from Stubbs and her son at the West Park Hi-Rise in West Philadelphia.
Neighbors said Stubbs has lived there for less than four months but brought plenty of drama to the floor.
Benson, 47, who lived on Franklin Street near Fairmount Avenue, would come and go from Stubbs' apartment, but most of the time he would go, because Stubbs, 31, was fond of throwing him out, Tucker said.
"He'd be sitting in the hallway - a lot - just sitting there with his bag and occasionally pounding on the door," Tucker said.
Aside from the fact that her son was still in diapers at the age of 4, neighbors said there were no overt signs that Stubbs was a bad mother.
"We would have never thought something would happen with her, with the dad, maybe, but she played her role pretty good," Tucker said.
Neighbors said police kicked Stubbs' door down Saturday night and returned again Sunday.
South Detectives Capt. Laurence Nodiff said police tracked the couple to the Hub Motel.
They were taken into custody without incident, police said.
"They didn't ask us anything about their son," said Scott Brous, one of the arresting officers.
Nor did the boy's extended family in the area contact police after his photograph was released to numerous media outlets over the weekend, Nodiff said.
The boy, whose name has not been released, remains in Department of Human Services custody, according to police.
Nodiff said there's a "definitive" possibility the couple used their son to appear unthreatening so they would be buzzed into the locked store, Platinum Ice & Jewelry on South Street near 6th, about 3 p.m. Saturday.
Police said that Benson and Stubbs asked to look at rings then created a diversion, and that Benson reached behind the counter and grabbed 15 rings, worth about $50,000.