I don't know you, never met you, don't know your father had never met him, so my condolences if sent would be showing a superficial or indeed false sense of emotions.
People are clearly sad when someone suffers a death, but in my opinion that is a personal thing, something for the next of kin and close friends, which in my opinion cyber friends do not include.
Again, in my opinion we see too much of condolences, which form only a moment arr of empathy soon to be expelled, which doesn't mean that we are not sympathetic.
In fact, this thread says more about YOU, than anyone or anything else.