It happened Sunday night in the Tompkinsville section.
Police say 81-year-old Joseph Naimo and his 74-year-old wife, Linda, had just closed their store on Victory Boulevard, when the thieves pushed them into a stairwell of their apartment next door.
They were then punched and kicked repeatedly.
When their 49-year-old son tried to stop the attack, he was also beaten.
The suspects took off with just $18.
Linda Naimo is in critical condition with a broken nose, jaw and fractured skull.
Joseph Naimo and his son suffered cuts and bruises.
"He kept saying, 'Give me the money,'" Joseph said. "I told him I didn't have money. He kept on swinging. He never stopped swinging. He put his hand in my pocket and he grabbed the few dollars I had, $18. And that was it. And he kept on swinging like he was going to kill us."
The male suspect is described as a black male, 6-foot tall and wearing a dark-colored hoody.
The female suspect is described as a black female, who was wearing a dark-colored hoody with fur around the hood.
There is a $12,000 reward for information that leads to the identification, arrest and conviction of the above suspects.
Anyone with information in regards to the above incident is asked to call Crime Stoppers at 1-800-577-TIPS (8477).
You can also submit your tips by logging onto the Crime Stoppers website at WWW.NYPDCRIMESTOPPERS.COM or by texting your tips to 274637 (CRIMES) and then entering TIP577.