Richard, John and Owen Sisk and family
Rank 2017
The fifth generation of the Sisk family runs Sicon, the €126m holding company of their construction group. Ownership is split equally between the families of the three retired brothers – George, 76, Henry, 74, and John, 72.  Three Sisks – Owen, 37, John Patrick, 41, and Richard, 45 – are directors. Dublin-based Sicon, which originated in Cork, has operations in Ireland, the UK, Poland and the UAE. It also has a property and healthcare portfolio. The families have received more than €122m in the past 13 years in share deals and dividends. We add €35m for other assets.