Cassie,
Edward Darcy Barrett's wasn't born in Maine. He was born in Quincy Mass. His obituary, along with your grandfather, Edward Darcy Barrett, III obituary are online. Something did happen to the family circa 1930. Your great-great grandfather had a business in Quincy prior to 1930. Hopefully with these clues you will find more information, I don't want to spoil the hunt for you by giving all the information to you. If you need more help, just post and I'll nudge you in the right direction.
The Other Cheryl