What does "Cooperstown family" refer to?
Native speaker’s answer
Rebecca
The National Baseball Hall of Fame and Museum that Homer Simpson has been inducted into is a museum and hall of fame located in Cooperstown, New York. When the speaker says "welcome to our Cooperstown family," it is another way of welcoming Homer Simpson to join the many others that have also been inducted into the hall of fame there. You'll see the expression "welcome to the X family" is often used to greet new members of a group or organization. Ex: Welcome to the RedKiwi family! Ex: Hi Kathy, welcome to our university family!