He was head of the UNIACKE Irish gentry family. He was s of Lt-Col Robie Dennis Woodgate UNIACKE 1905-ka1942 and Edith Barbara 1905-2000 d of Robert Swan CORBETT 1864-1938 by his 4 Sep 1901 m (St Margaret, Chipstead) to Edith Winifred NORRIS 1879-1955.
He m 1st 1957 Jennifer Sally 1936-1968 d of Cmdr Maxwell CUNNINGHAM RN 1901- and Elsie Veronica Havelock GROVES 1909-76, and had a son (ROBIE PATRICK MAXWELL Uniacke b 8 Oct 1960, who succ. his father as family head He m 1st 1983 (div 1988) as her 2nd of 3 h Lady Emma Bridget HOWARD b 1952 d of 12th Earl of CARLISLE 1923-94, and had a son ROBIE JONJO b 1984. He m 2nd 1988 as her 1st h Rose C BATSTONE and had a dau Olive b c1991 reg Q1 Westminster. He m 3rd the actress Rosalind PIKE b 1979 and had a further two sons, SOLO b 2012 reg Q2 K&C and Atom b 2014 reg Q4 K&C) and a dau (Camilla Alexandra b 1959, m 1985 Hon Jasper Jonthan Richard GUINNESS 1954-2011 s of 3rd Baron MOYNE b 1930 and his 1st w Ingrid Olivia Georgia 1931-2009 d of Maj Guy Richard Charles WYNDHAM 1896-1948 (gt gs of 1st Baron LECONFIELD 1787-1869) and his 2nd wife (Mar)Grethe Ingrid Andrea 1906-82 d of John Gerhard WULFSBERG 1883-1943 of Norway and Gudbjørg Nilsine WILLMANN-LARSEN 1888-1961, and had two daus).
He m 2nd 1972 as her 2nd of three h (her 1st was a scion of the Horlick Bts and her 3rd a scion of the Harewood earls) Hon Susan Geraldine VERNEY 1942-2009 d of 20th Baron WILLOUGHBY DE BROKE 1896-1986 and Rachel 1911-91 d of Sir Robert Bourchier Sherard WREY 11th Bt 1855-1917 and Jessie Maud FRASER 1880-1955, and had a further son (Caspar John b 1973 and is m with two sons) and a further dau (Kate Rachel b 1975 & d 1979).
His 3rd m in Oct 1991 was to Sarah Carinthia b 1951 d of Gen Sir Michael Montgomerie ALSTON-ROBERTS-WEST GCB DSO 1905-78 scion of that gentry family of Alscot Park and Christine Sybil 1913-2000 d of Lt-Col Augustus Charles OPPENHEIM DSO d 1967 (gt gs of 23rd Baron DUNBOYNE 1780-1850) and Audrey Beatrix 1887-1971 d of Lt-Col Augustus Henry MACDONALD-MORETON 1848-1918 (gs of 1st Earl of DUCIE 1776-1840, as also gs of Sir Richard SUTTON 4th Bt 1821-78).