West Ham goalkeeper David Martin made his Premier League debut on the weekend in the 1-0 win over Chelsea. The 33-year-old, a boyhood Hammers fan, was extremely emotional at the full-time whistle and went over to celebrate with his father Alvin, who played for the Hammers for 20 years between 1976 and 1996. The recent events got us thinking about the sons of past legends who are playing professionally today. Here are some of the best.