 Flannery's sister Sarah is a past winner of the Esat Young Scientist Exhibition. His mother's family live in Coolroe near Killarney. Flannery has a difficult relationship with his younger brother David, whom he had to reprimand regularly when they were younger due to his'peeping Tom' tendency among the villagers, namely an elderly woman who once knitted the young David a pair of socks. Mick states, in one of his more intimate interviews "David seemed to take the socks as a gesture of Mrs Murphy's sexual desire for him".
