Tony McGregor enjoyed a drive up the River Liffey on Thursday before stopping off at a restaurant for lunch.
Conor McGregor's father tucked into a large steak at Ryleigh's Rooftop Grill, which is located in Dublin's docklands.
Tony, who describes himself as an "international yachtsman of leisure", parked up his yacht, named The 188, across from the restauraunt on Thursday afternoon.