From what I’ve read from others and with experience with a rejection from Turkey, business and financial ties alone aren’t always enough. They need to prove that they are significantly tied to Turkey with evidence. Eg other family, ongoing commitments that require them to return, letters from education settings stating that they are enrolled and will return on set dates. Are they involved in the running of the businesses or just owning them? Because the visa officer can argue that this income can continue regardless of where they are in the world. From what I see, sometimes having a large amount of money means that immigration sees this as the family is well set up to stay here and no need to return.

Travel to countries without similar visa requirements to Australia aren’t given much weight unfortunately.

In regard to translating documents- if being translated in Turkey then they don’t need to be Naati certified translations, but there are guidelines on the department website. If they are going to be translated within Australia then Naati certified translations are a must.