There's much more to this case than "should Hanai Auntie be considered a bona fide family connection?"  (Remembering, of course, that hanai aunties are sometimes closer to us than blood kin...)

The underlying constitutional issue of separation of powers is the real player here.  

Trump took it upon himself to embroider the Court's decision by creating what His Trumpery considers an appropriate list of "bona fide family connections".  He also arrogated unto himself the power to change the effective date of his EO retroactively, half a year after it'd been promulgated.*  

So the question is, does the Executive have that unilateral power?  Or is Trump treading on the Court's toes, since they wrote the decision?  We, Hawaii, have a right to ask.  And Watson wisely pointed back to the Supremes for the answer.  It's in their lap now -- and that shouldn't give Trump any cause for complacency.

*Thus recreating Joshua's "making the sun stand still" trick, but he made it last for six months.