Liverpool Happy Birthday Son Card Perfect for any Liverpool football fans is this official Liverpool Happy BirthdayÂ Son Greeting Card with Badge.Â YourÂ Son will be the envy of his friends with his Red shirt card sayingÂ NO. 1 Liverpool FCÂ Fan. Â Inside the card itÂ says "You're the Greatest! Happy Birthday." There is also lots of space to write your own personal message as well.