Pictured: The brother and sister murdered by their father in their Sydney home

A mother has released photos of the innocent faces that fell victim to an unbearable tragedy.

Jack and Jennifer Edwards have been remembered as caring, kind and happy kids who protected their mum.

Jack, 15, and Jennifer, 13, were shot by their estranged father in a bedroom at their West Pennant Hills home, in Sydney’s north-west, about 5.20pm on Thursday.

It is a crime that has devastated not only family and friends, but the whole community.

“How could, how could this happen?” Local Carole Harding said.

Another said: “It just sends shivers down your spine”.

Jack Edwards was described as a nice guy. Source: 7 News

The children’s mother, Olga, returned to the home today, ushered in by detectives. She confronted the scene where her ex-husband John Edwards took the lives of their children.

About 12 hours after the teens were discovered, the 68-year-old father was found dead in his own home in Normanhurst, on Sydney’s Upper North Shore.

Jennifer Edwards was described as a supportive friend. Source: 7 News

Many paid tribute to the teens today, with school friends and sporting teammates among a steady stream of people paying their respects.

A teammate of Jack’s, Sean Allen, described the teen boy as a nice guy.

“Very tragic, very tragic what happened to him,” he told 7 News.

The teens were shot in their West Pennant Hills home on Thursday. Source: 7 News

Tracy Deng, a friend of Jennifer’s, described her as a great friend.

“She helped us around the school and she’s a really supportive friend,” she said.

Local Tim Osborne said it was terrible to think these types of crimes could happen so close to home.

A car was removed last night from outside Edwards’ house in Normanhurst. He reportedly hired one to avoid his children recognising him when he arrived.