strange relations

Blood is not really thicker than water. neither birth, nor blood bring together relationships.its shared concern, communication especially the capability to listen,an internal alarm to sense others needs and respond and yet manage self preservation and really being there in times of need and trouble that really builds and nurtures relationships.why do we spend so much time nurturing relationships bound by birth ,when relationships outside are significantly more meaningful and less demanding and infinitely less complicated ...i guess life is strange and relationships are stranger.....