DURHAM — A brother and his pregnant sister were shot to death and a third person was wounded Wednesday night in a shooting inside a Durham apartment.

Police arrested Donte Perkins, 23, in connection with the shootings of the three people, two of which police said were his cousins. Perkins was charged with two counts of murder and one count of assault with a deadly weapon with intent to kill.

Jarvis Lassiter, 23, and his twin sister, Jarvlin Lassiter, were killed in the shootings.

The pregnant woman's premature baby, who weighs less than 2 pounds, survived the shooting and was in intensive care Thursday. The baby's grandparents arrived in Durham this afternoon from Boston, knowing they'll have to bury two of their children and hoping that their grandchild survives.

Authorities said the shootings happened inside an apartment at 4613 Hope Valley Road.

The two people killed were fraternal twins and shared the apartment with the third victim, who was shot in the leg and whose injuries were not life-threatening. Perkins also lived in the apartment, according to police.

"There's no explanation for it," said Durham Police Capt. Chris Allen. "It's tragic."

Perkins, who had hoped to return to North Carolina A&T in the fall, spent most of the evening before the shootings at his parents' home -- and no one noticed anything out of the ordinary.

Police said Perkins has no criminal record of which to speak and no history of violence.