Question: Arthur Stanley Brown is a prime suspect in the crime that took place on what date?
Sentence (from "Beaumont children disappearance"): The Beaumont children were three siblings, Jane Nartare Beaumont (born 10 September 1956), Arnna Kathleen Beaumont (born 11 November 1958), and Grant Ellis Beaumont (born 12 July 1961), who disappeared from Glenelg Beach near Adelaide, South Australia, on Australia Day, 26 January 1966.
Relevant evidence: Yes