I assume the quote was taken from a promo for the show, or a review of it? Taken out of context like that it is hard to say for sure. However, when you say that people 'just click', it means that they have an instantaneous affinity with each other - they just get on, and feel completely comfortable with each other and have an easy familiarity straight from the beginning. However as this group of people are a family and have been together for sometime, it is hard to see how that meaning could apply here. As always, without context, it is hard to be sure.

Sorry, I like the American show" Modern Family", it's a family name in it, I am not sure if I spelled it correctly.... :(

I'm more interested in what a "dunphy" is. Are you sure you've spelled that correctly?