The relationship between sisters is truly unique and in this film the relationship between sisters Gabby and Tam were put to the test.  In reality, this is  a common scenario among girls with older sisters who are leaving childhood in favor of adolescence.  But in a unique incident that ensued,  the two sisters somehow found common ground  with the participation of a  giant spider-like creature with a human face.  Sisters will always be sisters  and in each of their uniqueness as a person it only proves that blood is  indeed thicker than water.