CREATE TABLE table_57464 ("Election" TEXT, "1st Member" TEXT, "1st Party" TEXT, "2nd Member" TEXT, "2nd Party" TEXT, "3rd Member" TEXT, "3rd Party" TEXT)

What is the name of the 1st Party that has a 3rd Party of Unionist, and 2nd Member of Sir John Boyd-Orr?
SELECT "1st Party" FROM table_57464 WHERE "3rd Party" = 'unionist' AND "2nd Member" = 'sir john boyd-orr'
SELECT "1st Party" FROM "table_57464" WHERE "2nd Member" = 'sir john boyd-orr' AND "3rd Party" = 'unionist'