CREATE TABLE table_15991 ("Case/Suffix" TEXT, "we two" TEXT, "you and I" TEXT, "you two" TEXT, "them two  ( the two ) " TEXT, "who-two" TEXT)

What is them two (the two) when you and i is ng balngu?
SELECT "them two (the two)" FROM table_15991 WHERE "you and I" = 'ngœbalngu'
SELECT "them two (the two)" FROM "table_15991" WHERE "you and I" = 'ngœbalngu'