Believe those naive words and you will only fool/cheat yourself and thus end up lonely.
Would you replace your own father/mother and brother/sister with a random acquaintance who will forget you the next day? No!
No matter what you say blood will be always thicker than water, and so these other acquaintances from different clans will always put their own kind before you. That is the bitter truth.
My favorite is Sasuke is for the key fact of his fightning spirit to keep going even against the odds of losing is high, at first i really disliked him but now he's slides in my book but Itachi comes second.