The seven-year-old, the eldest of four children of the Dubbo man police allege was murdered, wants to know when her daddy will come home.

It's a question that has become no easier to hear as the hunt for Mr Rez's body continues almost four weeks after he was last seen alive.

Family spokeswoman Frances McIntosh said they longed for a breakthrough in the police search, which earlier this week focused on the Macquarie River near Troy Bridge.

The family just wished the body of the 33-year-old would be found so they could lay their loved one to rest, Ms McIntosh said.

"For the children's sake," she said.

"The seven-year-old keeps saying, 'When's Daddy coming home?'.

"She just wants her daddy back."

Ms McIntosh, Tony Wilson and other friends have rallied to support Mr Rez's four children, aged between one and seven years, who are in the care of their grandmother.

Sarah Renea Tarrent, Mr Rez's 24-year-old de facto wife, and 51-year-old Raymond Isaac Roff, a long-time family associate, have been charged with his murder.

Yesterday finishing touches were being made to a fundraising event to be held undercover in the Dubbo RSL Memorial Club car park today.

Ms McIntosh said a number of people had contacted her via Facebook with items to give away, while Samantha Tailby had taken on a lot of the work, organising the venue and donations of goods from Narromine.

Ms McIntosh also said a "big thank you" to Vicki Chatfield and Linda Snelson for their donations and paid tribute to the community's generosity.

"People say they wouldn't go to Dubbo, but... I've never seen a community come together like (it does)," she said.

"Dubbo has a heart.

"I've seen so many people reach into their pockets or bend over backwards to help this family.

"I don't know how to describe it, it's so amazing."

Ms McIntosh invited the community to support today's event, starting at 8am and finishing at midday.

People with goods to sell or donate were asked to bring them to the car park between 7am and 8am.

Those who wanted to set up a stall of their own could do so for a $20 fee, which would also be directed to supporting the children, Ms McIntosh said.

There would be raffles, a jellybeans guessing competition and someone had offered to make cakes for a cake stall, she said.

For further information Ms McIntosh asked people to contact her on 0477 122 751 or contact Mr Wilson through the Dubbo NSW Trash N Treasure page on Facebook.

A trust account for the children has been set up at the Greater Building Society in Macquarie Street.

Donations can be made to trustee Miss Zonia at BSB 637 000 and account number 719893791.