The term 'Oboe Cousin' refers to two instruments that are related to the oboe. The first is the BASSOON, which is a double reed woodwind instrument that is commonly used in orchestras and concert bands. It has seven letters. The second is the English horn, which is a larger version of the oboe and is also a double reed woodwind instrument. It has eleven letters. Both instruments are related to the oboe and are often used in classical music.