The mother of Jack and Jennifer Edwards, the teenage siblings shot by their estranged father in Sydney, has been found dead at her home in West Pennant Hills.

Olga Edwards was found dead by police around 10am on Wednesday, when they responded to a report from a neighbour with a concern for welfare at the same home where the bodies of the children, 15-year-old Jack and 13-year-old Jennifer, were found riddled with bullets in July this year.

Olga Edwards was found dead by police around 10am on Wednesday. Credit:LinkedIn

Ms Edwards' family, who live in Russia, have been notified. It is understood her mother had only recently returned to Russia from Sydney, where she had been staying with Ms Edwards to support her in the months since the shooting.

The cause of Ms Edwards' death has not been released by police.