Taupō Mayor David Trewavas and Taupō MP Louise Upston also popped in to wish him well.
Until four months ago, Jack had been living in his own home in Marton but had recently moved to Taupō because of his health and to be closer to his son.
Peter said they would be holding a small, private ceremony for family in Taupō but there would be a public ceremony in Marton, on June 3, where Jack lived for most of his life.
Peter said the flag was flying at half-mast at the Marton RSA, where Jack was a life member, and there would be a plaque made up in his honour.