Hundreds of thousands of dollars was paid to the late Katherine Panin's son's second partner and grandson after they made a claim over her deceased estate, a murder trial jury has heard.
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Mrs Panin died on October 12, 2015, but police later alleged she was murdered.
The 82 year old's daughter in law, Archibald Prize finalist artist Melissa Beowulf, 61, and her two grandsons Thorsten, 32, and Bjorn Beowulf, 31, are on trial after pleading not guilty to murder.
A focus of their ACT Supreme Court trial, which started last week, has been the unconventional lifestyle Mrs Panin's son, the late Thorhammer Beowulf, lived.
He had four sons with his wife Mrs Beowulf and another son with his second partner Dianne McGowan in a family unit that lived together for many years.
Dr McGowan entered a third day on the witness stand on Tuesday.
The jury heard that she moved out of the family home at Red Hill a few weeks after Mrs Panin's death.
She later made a claim for a portion of the woman's substantial estate in litigation that began shortly after the elderly woman's death.
Dr McGowan was eventually paid $300,000, and her son $100,000, the jury heard.
Under cross examination by defence barrister Ken Archer, Dr McGowan agreed the claim was based on her looking after Mrs Panin and her contributions working on the family's Woollahra property.
Her son's claim was based on his being Mrs Panin's grandson.
Dr McGowan agreed that the first letter from her lawyers about the claim was sent to the Beowulfs without prior warning, but denied that she actively disguised it.
The court also heard that Mrs Panin underwent and passed a dementia test in the months before her death.
Dr McGowan said Mrs Panin was concerned that Mrs Beowulf was trying to get her into government housing and a pension.
She could not say whether Mrs Panin had suggested there was a link between the dementia test, the government housing and the pension.
Though in an earlier interview, the court heard Dr McGowan said Mrs Panin was concerned because she thought her family was trying to prove she was not looking after herself.
The witness also agreed under cross examination that Mrs Panin was in the habit of wearing thongs and had experienced falls in recent times before her death.
The Crown contends that Mrs Beowulf and two of her sons murdered Mrs Panin by hitting the woman and either leaving her to die or smothering her before arranging her body at the foot of the stairs.
The defence says the woman fell down the stairs.
The trial continues.