Thank you for your help and responses. I agree that it would be wrong to take children to Australia without permission. That was never and would never be the plan.
It would just mean moving at different times, but of course with full consent of both parents.
He would be there first, and I wanted to be sure we could still follow,should things get complicated.
Never would I be taking them away first, or without consent.
I just wanted some idea where I'd stand. I don't want them to miss out, or to not be close by to their dad.
Hopefully things resolve themselves.
Thank you