I am very sorry to hear of this case, which must be distressing for all involved. As the Deputy will be aware, matters related to Australia's border restrictions are managed by the Australian Government. The Department of Foreign Affairs role is therefore limited in such instances.
However, the Consular Assistance team in my Department has engaged with the family in question on how to apply for a travel exemption to Australia, given the circumstances faced. My understanding is that the situation has now been resolved.