Dinner conversation

I do not understand why some families do not have dinner together more often. The comedic material that becomes available at dinner is just astonishing! The following conversation occurred at dinner this evening:

JC: Today we watched a movie about Thomas Jefferson. At the end he passed away.

me: Yes, Thomas Jefferson is dead.

JC: Thomas Jefferson invented the light bulb.

me: No, Thomas Jefferson did not invent the light bulb. Thomas Edison invented the light bulb.

JC: Oh.

me: So did you watch a movie about Thomas Jefferson or about Thomas Edison?

JC: Thomas Edison. At the end he passed away.

HT: That means he died.

me: Yes, thank you H. I am aware of what that means.

JC: Is Thomas Jefferson dead?

me: Yes, Thomas Jefferson is also dead.

JR: Thomas Edison is blind.

me: No, Thomas Edison is not blind. Helen Keller is blind.

JR: Last year we read a book about Thomas Edison being blind.

Husband: (who apparently remembers this) No, last year you read a book about Helen Keller.

JC: Is Helen Keller dead?

me: Yes, Helen Keller is also dead. What was the name of the woman who worked with Helen Keller? It wasn't Anne Frank...she was the one with the diary.

Husband: It wasn't Annie Oakley. She was the sharpshooter.

me: And yes, JC, these people are all dead.

JC: Why do I care?

AGH! I have no idea how our conversation took this turn! I have to laugh at it though! Maybe the reason more people don't have family dinners together is because they have long ago lost their sanity with it. And yes, I did look it up on the internet and realized Anne Sullivan used to work with Helen Keller.