A Facebook group launched as part of the search for Jack has surpassed 103,000 members and sees a flurry of new posts every day.
Ben O’Sullivan, Jack’s older brother, has said this continued spotlight is what keeps his family optimistic they will one day find answers.
“Until we get clarity on what happened, it doesn’t feel right to just roll over and accept that Jack’s not here,” he said.
“These [anniversary] landmarks, for me, are insignificant when we’re looking at the bigger picture we’re trying to solve here.”
Catherine has said that “hope is the key word in all of this”.
“We don’t have an answer, but we don’t have any evidence to suggest that Jack’s gone, other than obviously he’s not here,” she said.
“We’re not giving up and we continue to keep asking questions and raising the profile of Jack. We will continue to keep the hope alive.”