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Robert Irwin was born on September 12, 1928 to Robert Irwin and Goldie Anderberg Irwin. Source: http://en.wikipedia.org/wiki/Robert_Irwin_(artist)
Robert Walker Irwin died in 1925.
Robert Walker Irwin was born in 1844.
Robert George Irwin was born in 1908.
Bindi Irwin's brother's name is Bob Irwin.