Royal has only been operating for a few months in Australia since the pandemic.
But before the pandemic they stopped linking family members. I know they do set up a family group in America but not in Australia.
In compensation we could take our spouse,partner or cabin mate into the diamond lounge.
We seem to have some variation here.
My sister said it wasn’t automatic,she had to go to the loyalty Ambassador and ask. The L.A gave her friends a new seacards which had diamond on it.