Bob Katter · Wikipedia (en)
For Robert Carl Katter & Susan Mary O'Rourke
"Katter married Brisbane socialite Susan O'Rourke in 1970. They have five children together: one boy, Robbie, and four daughters. They also have fifteen grandchildren."
Corroborates the child set independently of the register's wording - though not independently of the register itself, which Wikipedia's article cites. Also the only source found that names the son: 'Robbie', matching Robert Ignatius Katter #52284. Nothing here names the four daughters, so none of their records is touched.