An elderly Perth couple who had $1.6 million taken from them by their sons have had the funds retrieved after a fight by their granddaughter.

The couple, who are in their 80s and suffer from dementia, had lost the proceeds from the sale of their farm in Wyening after one of their sons transferred the money to his own account before dividing the proceeds with his two brothers.

One of the son's daughter, who had interceded on her grandparents' behalf, has described the return of the funds after a ruling by the State Administrative Tribunal (SAT) as "fantastic news".

But she said she was still concerned about the elderly couple.

"My granddad's recall is much worse, [he] only remembers things for a few minutes," she said.

"I'm glad their have been some good outcomes but it's not changed anything in improving my grandparents' health that much or us being able to see them.

"From what I can tell they still don't have adequate care or stimulation. It's been hard for the guardian to do much with the initial lack of funds."

In October last year, the SAT appointed the Public Trustee as administrator for the pair after finding they were the victims of "questionable transactions".

It was the granddaughter who had sought an independent administrator, and guardian, in defiance of her own father and uncles.

A guardian was appointed for the grandmother.

The couple are both in their 80s and suffer from dementia. ( ABC Central West: Melanie Pearce )

The SAT had refused an application from the sons to act as administrator and guardian, rejecting their claims that the elderly couple were vulnerable to exploitation by their grandchildren.

The sons had gifted the couple's Mullaloo residence to themselves in May 2017, but the tribunal found their mother did not have the legal capacity to make such a decision.

The granddaughter said the current status of the ownership of the home was uncertain.

"The last I heard they are still trying to get the house transferred back," she said.

While the $1.6 million from the farm sale is now in escrow with the Public Trustee, the granddaughter said she had called on the Trustee to pursue other lost funds.

The Public Trustee was unable to comment on the matter.