On Australia Day, Wednesday 26 January 1966, the three Beaumont children – Jane (aged 9), Arnna (aged 7) and Grant (aged 4) – left their home at Harding Street, Somerton Park to go the beach at Glenelg.
Confirmed sightings of the three children were at Colley Reserve, Glenelg and Wenzels Cake shop in Mosley Street, Glenelg.
They have not been seen or heard of since despite extensive and ongoing investigations into their disappearance.
Police suspect the children have been abducted and murdered.
A reward of up to $1m is on offer to anyone who provides information that leads to the conviction in the case and/or the recovery of their remains