A team of British police officers and search specialists arrived in Kos last week to help a Greek investigation which will focus on a large mound of earth and rubble close to where Ben was last seen.
Ben, from Sheffield, vanished on the island in July 1991, when he was 21 months old, after his mother and grandparents, Eddie and Christine, moved there to renovate a farmhouse.
Ben's mother, Kerry, has returned to Kos with her parents to help the police with any questions and support them during their search, but she says she won't go to the site where Ben vanished.
"The place kills me, so knowing what the police are doing there, I don't think my emotions could take it."
Ben Needham's mother flies to Greece as police prepare to dig up mound
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Missing: Ben Needham Timeline
British police begin digging for missing toddler Ben Needham