What do you know?

What is it to truly KNOW someone...
  To be on their inside,
     live through their thoughts,
     feel their pain,
     cry their tears,
     see through their eyes,
     reach for their goals,
     understand their fears,
     deal with their failures,
     struggle with their doubts,
     share in their love,
     celebrate their achievements,
     appreciate their tastes,
     follow in their footsteps.
The sum total of these alone leave us
     at best hoping to know ourselves,
     and family as strangers most familiar.