"Out of the blue some girl e-mailed us and said 'I think you should know someone's using Jake's picture,'" Jenni Brennan told WCVB-TV, Boston, in a story published Monday.
Brennan clicked the link in the e-mail and found a Craigslist ad that said a "cute baby boy" was available for adoption. Playing detective, Brennan said she sent a message to the address listed and quickly received a photo of her son, Jake.
The picture had been lifted from their family blog, Brennan said, calling the incident "horrifying."
The e-mail said the boy pictured was Canadian born, living at an orphanage in Cameroon and that Brennan could begin the adoption process for $300, she told the FBI and the state attorney general's office.
Brown now has restricted access to her family blog, while Yahoo officials told her they have shut down the e-mail account used in the posting.