Family ETA Visas
It is required by Australian Laws that each person entering Australia is accounted for. This means that each member of your family coming to Australia must have an individual ETA Visa. No exceptions. Children are also required to have an ETA visa per child.

This can be either on your passport or on their own passport.

Please Note:
If the child has their own passport, then you must register the ETA using the exact passport of the child the ETA is being applied for. If the child shares your passport, then you must use your passport and their personal details when you apply.