What is a close familial relationship for the purposes of determining if someone is subject to the E.O.? 

In light of the July 13, 2017 U.S. District Court of Hawaii ruling regarding the definition of “close familial relationship” as that phrase was used in the Supreme Court’s June 26, 2017 order on implementing Section 2(c) of E.O. 13780, a close familial relationship is defined as a parent (including parent-in-law), spouse, fiancé, child, adult son or daughter, son-in-law, daughter-in-law, sibling, grandparents, grandchildren, brothers-in-law, sisters-in-law, aunts and uncles, ‎nephews and nieces, and cousins. For this purpose, “cousins” are limited to first-cousins (i.e., each cousin has a parent who is a sibling of a parent of the other cousin). For all relationships, half or step status is included (e.g., “half-brother” or “step-sister”). “Close familial relations” does not include any other “extended” family members, such as second-cousins. - Travel.State.Gov alert, 14 Jul 2017