question: Who is the third member of the Liberal Party, a third party conservative, the second member Humphrey Mildmay?
answer: SELECT third_member FROM table_name_2 WHERE second_party = "liberal" AND third_party = "conservative" AND second_member = "humphrey mildmay"
context: CREATE TABLE table_name_2 (third_member VARCHAR, second_member VARCHAR, second_party VARCHAR, third_party VARCHAR)