BOSTON -- The family of a woman who was found slain in Hopkinton, Mass., last weekend has broken their silence, once week after Rachel Entwistle, 27, and her 9-month-old baby girl Lillian were discovered shot to death in the bedroom of their suburban home.

NewsCenter 5's Gail Huff also reported that Massachusetts investigators returned from England Sunday after going there to question Rachel Entwistle's husband, Neil, 27.

Enwistle's family is saying they are confident investigators will find out who's responsible for the crimes.

"From the birth of Rachel's daughter, Lillian Rose Entwistle, last April, Rachel shared her greatest love -- that of being a mother. As the family continues to grieve, we also celebrate and are grateful for the time we had with Rachel and Lilly," family spokesman Joe Flaherty said said in a statement on behalf of Rachel's mother, Priscilla Matterazzo, stepfather Joseph Matterazzo, and Rachel's brother Jerome Souza.

Neil Entwistle was not mentioned in the family's statement and his name was also absent from Rachel Entwistle's death announcement, which was printed in a local newspaper. He has not told investigators whether he plans to fly back to Massachusetts for his wife and daughter's funerals, which are planned for Wednesday in Plymouth. His BMW remains parked at Logan International Airport and he is free to travel without restrictions.

Massachusetts investigators were reportedly unable to get Neil Entwistle to answer questions at the U.S. Embassy in London Friday. They returned to Boston late Sunday.

"The family has every confidence that the Middlesex District Attorney's office, Martha Coakley's office, along with the Massachusetts State Police and the Hopkinton Police department, will solve this case and bring to justice those responsible," Flaherty said.

Police continue to call Neil Entwistle a "person of interest" in the investigation. He continues to stay at his parents' home 150 miles north of London.

One British newspaper suggested that the Entwistles might have been victims of a vendetta, citing threatening e-mails about Rachel that accused her of being a thieving liar. Investigators are looking in to the Internet business run by Neil and Rachel Entwistle. Their account was closed in early January after numerous complaints from customers claimed that the Entwistle's "get rich quick" offer was a scam.

The British newspaper The Observer reported that several unnamed sources in the department claimed that detectives are looking at the deaths as a possible execution.