The grandparents and grandson attacked at a Brooklyn subway station this week were left with swollen faces and needed stitches after the brutal attack that ended with the suspect shoving the elderly woman onto the tracks, their family said Tuesday.

The attack unfolded around 1:45 p.m. Monday when Bi He, 73, husband Ren Bao, 82, and grandson Henry Cheng, 30, were inside the C train’s Clinton-Washington stop together.

Henry Cheng had asked a man to stop smoking on the subway platform, according to police.

In turn, the man charged at him and punched him repeatedly in the face. He also hit Bao when he tried to step in, cops said.

The grandma attempted to pull the man off her grandson, but he shoved her onto the tracks, according to police.

Luckily, she was not hit as a train pulled into the station.

The grandfather is now at home but the grandmother and grandson are still at the hospital, the couple’s daughter, Ren Cheng, said in Mandarin as her son, Alvin Cheng, translated.

“Their entire faces are swollen,” she said, adding that her father and son got stitches in their faces.

One of her mother’s feet “looked twisted,” she said.

“They said it might be broken,” she added. “I don’t know.”

Her father was “really, really upset” over the incident, and asked, “How could someone do something like this?” she said.

Alvin said he’s “never been too worried” for their safety, until this “heinous” incident happened.

“I was pretty mad in terms of what happened and how it happened, especially because my grandparents were involved,” he said. “It hit a little harder just because of their age. When I found out about my grandmother, that part especially hit me the most because she almost got hit as she fell on the tracks. I felt a little better knowing the train stopped pretty far away.”

He said his grandmother might need surgery and his brother, Henry, is “relatively fine.”

He added that he isn’t surprised Henry spoke up if the smoke was bothering his grandparents.

“Knowing my brother, he cares a lot, especially because [it’s] my mom’s parents,” he said. “If it involves our grandparents, he would definitely say something.”

As for the attacker, he said, “I would tell them to turn themselves in, but I have other words that wouldn’t be too friendly.”

Police released surveillance images of the suspect Tuesday morning.