(January 10, 2018, 9:04 AM EST) -- WASHINGTON, D.C. — An adoptive couple seeking to retain custody of a 3-year-old Indian child asked the U.S. Supreme Court on Dec. 29 to decide whether the child’s biological father can intervene in the adoption proceedings under the Indian Child Welfare Act (ICWA), 25 U.S.C. § 1901 et seq. (R.K.B. and K.A.B. v. E.T., No. 17-942, U.S. Sup., 2017 U.S. S. Ct. Briefs LEXIS 5214)....