marianne,
i've always considered my "adopted" family at least as important (if not more important) as my blood relatives...
the family one "adopts" are chosen because they fit !
the family one is born into, are given - we have no choice about them - don't get me wrong - i do love my brothers and their families, my cousins and their families, etc., but i seem to have a much closer relationship with my friends' kids than i have with most of my "true" nieces and nephews... and they all live on the other side of the world from me - i see them - if i'm lucky - a few times once a year - often even less...
friends become family and - when we're lucky - family members are also friends
and here on TQS - i have found a new family as well