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21 August 2015 Last updated at 19:51 BST
Dave Libby worked during the 1960s for a firm in Watford alongside his grandfather, his father and his brother-in-law.
Mr Libby, who is being treated for advanced mesothelioma, has been paid compensation by the company concerned.
Both his grandfather and brother-in-law were diagnosed with mesothelioma. His father died of a lung-related condition, although it was never diagnosed.
A man from Milton Keynes is to become the third in his family to die from asbestos-related cancer.