Coming back in J on QF12 a couple of years ago, we had a child (?3yo) and mother in seats in front of us. The child screamed and cried and yelled and kicked the bulkhead as well as jumping up out of her seat and throwing herself in the aisle for 8 of the 13 hour flight. Being a night flight, this made for an unpleasant and exhausting journey The FAs were brilliant, trying everything to calm the child down without any success.
I noticed that the mother was replaced by the father for 3 hour stretches at a time.
When the FA queried what both parents were doing, the mother said (quite loudly, intentionally or otherwise) "she's always like this when we fly. That's why we book one seat back in PE so that we can take turns getting some rest on this long flight whilst the other looks after our daughter!"
Yeah right, what about the rest of Emerald City?