Actor Hrithik Roshan has opened up about what his father, filmmaker Rakesh Roshan, told him he should keep in mind while working with different directors. The father-son duo has worked together in the blockbusters Kaho Naa... Pyaar Hai, Koi Mil Gaya, Krrish and Krrish 3 as director and actor. My father said that 'you must have four-things mutual-respect, a strong head, courage and tolerance'.