Most professional translators tend to specialize in a particular field of translation, even if they take on relatively mundane tasks from time to time which any translator with the right language combination can handle. Generally, the more specialized the topic, the higher the price the translator can expect to charge a client.
Are you in the process of migrating to another country as a family? If so you will need to provide translations of many of your family documents. If you intend to migrate to Australia, all your translations will need to be completed by an accredited NAATI translator qualified in both English and your language.