A dramatic twist has emerged in the case of a suspected domestic double murder.

An alleged gunman remains under police guard in hospital, after the fatal shootings of his mother and brother.

An 82-year-old woman was found with a gunshot wound in her Red Cliffs home, near Mildura, shortly after midday on Tuesday.

It’s alleged the shooter – believed to be her son – drove about 100 kilometres to another house in Rufus in far western New South Wales where he allegedly shot his brother, whose body was found an hour later.

It’s understood the 58-year-old later turned the gun on himself.

In a dramatic twist, The Herald Sun reports the alleged gunman is believed to have first gone to his brother’s house with a real estate agent before shooting his sibling.

The real estate agent was left tied up at the property, before the alleged shooter drove to his mother’s home.

Police have confirmed a four-year-old child was inside the home when his great-grandmother was allegedly shot dead.

The child was discovered by police unharmed when they arrived at the property around 12.30pm.

The real estate agent was released unharmed before the alleged shooter was found at Lake Victoria around 3pm.