His father Henry (1829–93) had been the Dublin manager of the Guinness Mahon bank.
Guinness World Records | Guinness | Alec Guinness | Guinness family | Bunny Guinness | Mahón | Lulu Guinness | Guinness Brewery | George Mahon | Desmond Guinness | Derek Mahon | Os Guinness | Loel Guinness | Guinness Peat Group | Denis Mahon | Walter Guinness, 1st Baron Moyne | Tim Mahon | Kevin Mahon | Jonathan Guinness, 3rd Baron Moyne | Ivor Grattan-Guinness | Hugo Guinness | Arthur Guinness | Alice Mahon | William D. Mahon | Walter Guinness (first Lord Moyne) | Tina Mahon | Thomas Mahon, 2nd Baron Hartland | Rupert Guinness, 2nd Earl of Iveagh | Patrice de Mac-Mahon, Duke of Magenta | Mark Mahon |