Farmers Les and Jean Kelly lived together for more than six decades and died six days apart.
The couple's large family is heartbroken at losing them but confident "they needed to be together".
Dubbo resident and eldest daughter, Lesley Hyland, has told of her parents being "joined at the hip".
"It's been really tough but we will look back and know that it is the best thing that could have happened because they were just so close," she said.
Amos Leslie Kelly, 91, died on March 4, and his wife Jean Dorothy Kelly, 83, on March 10, after battling ill health.
They will be farewelled at a joint funeral service at St Andrew's Chapel in Dubbo on Saturday before being buried together in one grave at the Western District's Memorial Park.
The couple leave behind five grown-up children who sing their praises, nine grandchildren and seven great-grandchildren.
Les Kelly was born in Young but proved a top-notch student and sportsman at Dubbo High School after his family moved to the town in 1939.
Jean Kelly (nee Howe) was born in Dubbo and embraced by the Armstrong family after her mother died.
A keen sewer, she worked in a corner store and helped out at home before meeting her husband-to-be at a dance.
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Married at Holy Trinity Church in Dubbo in 1955, they raised a family as they farmed at Mogriguy and later Balladoran.
Mr and Mrs Kelly shared the workload while enjoying cricket, tennis and golf.
They encouraged their children to "try their best" at school and elsewhere.
Mrs Kelly received the devastating diagnosis of Alzheimer's disease in 2014, a factor in the couple moving to the Cooee Lodge Hostel in Gilgandra in 2016 and Holy Spirit Dubbo late last year.
Mrs Hyland said the secret to her parents' long marriage was simple.
"They just loved each other," she said.
The funeral from 10am is in the hands of Shakespeare Funerals.
In lieu of floral tributes, donations to Dementia Australia can be left with the funeral director at the service.