Neil, yes, some were left behind with family, others disappear from the records.
John Steadman HURREY married three times:
First - Caroline LEEDEN, 1834, they had Thomas, John, Caroline And Fanny. Caroline senior dies in 1839. I trace Thomas living with his grandparents in 1851 and then travelling to Victoria in 1852. John disappears after birth. Caroline junior died in at the age of 1. Fanny stays in the UK, was living with grandparents in 1851 and with an aunt in 1861.
Second - Elizabeth GRINDELL, married 1839 (barely 6 months after Caroline's death). Had seven children, 2 died very young in the UK, the remaining 5 travel to Vic with their parents in 1850.
Elizabeth died 1851. He waited over a year this time to marry Harriet in 1852. Not sure if she was lumped with the 5 children. They would have been 3, 6, 9, 10 and 12.
Then third - Harriet, they had six children who all lived through childhood.
John Steadman HURREY was an auctioneer, Trove has numerous records of auctions he ran plus a few mentions of financial ups and down.