At long last we have received our 143 parent visa.
it has taken 6 years and 2 months.
best of luck to those who continue to wait.
timeline,
applied August 2016.
June 2022 request to get medicals.
July 2022 request for police certificates.
august 2022 AOS paid
October 2022 visa granted.
the delay between AOS and grant of visa was apparently caused by an error between payment of $14,000 and it being sent to the relevant place! Irritating but all over now.
best of luck to those who are still waiting.