Never one to show much emotion, Rachel’s father, nevertheless, feels very close to his youngest daughter. He might not understand her desire for wanderlust, but he can see she enjoys travelling to new places and learning about new cultures. It might not be his lifestyle choice - being a traditional man at heart who loves ‘Coronation Street’ and the concept of families all living within a one mile radius of each other - but who is he to judge? He knows that trying to ‘cage’ his youngest daughter would be like clipping a beautiful bird’s wings. And it’s not right to do that. Besides, Greece isn’t far - and it gives him an excuse to go and visit this beautiful country he, himself, has had the opportunity to have dealings with when in business before he retired.
He is rather bewildered by the animosity between his two daughters and really cannot understand it. Besides, even if he did he’d choose to ignore it - it’s easier to not have to confront.
I think the character of my father was one I didn’t need to embellish upon as in the book and movie script, ‘John’ stays pretty much true to form. He does care about his daughters but, maybe it’s a male trait, is really bewildered by the antagonism between them and can’t - or chooses not to - look at himself to see if any of his actions may have helped to cause them, either through favouritism, lack of attention to ‘Kirsty’.
Even through he’s a periphery character, within the context of the book and script, he’s a pretty central figure, and a strong one at that.