A woman who was shot in the stomach at her Sydney home overnight is the mother of Brothers 4 Life founder Bassam Hamzy.

Police were called to the home in Auburn on Albert Road shortly after 8:30pm AEDT where they found 57-year-old Lola Hamzy with gunshot wounds to her stomach.

They believe the shots were fired through the front door of her house when she was home alone.

She was taken to Westmead Hospital and is now in a serious but stable condition and is undergoing surgery.

Inspector Al Janson said despite the link to Brothers 4 Life, police do not know the motive behind the shooting.

"The family's known to police, however, why the rounds were fired at that home last night, we don't know," he said.

He said police were not concerned yet about the possibility of reprisal shootings over the weekend.

The targeted property belongs to two members of the Hamzy family, which has strong links to the Brothers 4 Life gang.

Bassam Hamzy is Australia's highest security prisoner at Goulburn's Supermax jail.

Neighbours said they heard shouting, gunshots and then a car driving away from the scene quickly.

There were large tyre skid marks outside the home and detectives are now door-knocking local residents.

The Middle Eastern Organised Crime Squad joined with local police for the investigation.

The Auburn property is owned by two members of the Hamzy family. ( ABC News )

NSW Opposition Leader John Robertson said gang violence would continue because there were not enough police.

"We've got a government that said they were introducing the toughest laws in the nation when it came to gangs, something that Labor voted for and supported," he said.

"Sadly we've seen no action on that front.

"If we're going to solve this problem, it will be solved by more police on the streets and enacting the gang laws, outlawing the gangs that are carrying out these shootings."