Domestic violence warning after Syd deaths

The family of a woman and her son who died in Sydney have urged victims of domestic violence to speak up before it's too late.

File image. Source: AAP

The cousin of a woman who died with her two-year-old boy in Sydney has urged people to speak up about domestic violence before it's too late.

The bodies of the 25-year-old and her son were found at Maroubra on Thursday night.

It's believed she was suffering post traumatic stress disorder (PTSD) linked to domestic violence.

Her cousin described her to Network Ten as a "wild girl" who loved horses and rode bulls, and her little boy as a "beautiful little kid".

He urged victims of domestic violence to seek help.

"Speak up to it, don't take it no more because it takes its toll on people, leaves devastating results," he said.

Police say they're not looking for anyone else in connection to the deaths.

* Readers seeking support and information about suicide prevention can contact Lifeline on 13 11 14.