Mother could not take her son to Greece because the son did not have a passport which required the father's signature which he refused.  The alternative might have been to just take the son someplace in the US mainland, as checking on the TSA website, traveling to US mainland cities and returning back to Hawaii does not require picture ID or passport for traveling minors but suggest a parent carry their kid's birth certificate.  Of course if the mother did that and took away the son from the father without court approval, Aikau and his lawyer could file kidnapping charges and in court the mother might eventually end up losing custody of her child.  Sad story and no matter what decisions were or were not made, it appears this story would end up only in tragedy.