Conversation so far:
Where was Chamberlin born?
Chamberlain was born in Brewer, Maine.
Who was his mother and father?
Sarah Dupee (nee Brastow) and Joshua Chamberlain.
What day was he born on?
September 8, 1828.

Question: What was unique about chamberlins family tree?
Self-contained rewrite: What was unique about joshua chamberlain's family tree