More information from the U.S. Federal Census:
1920 Massachusetts - Middlesex County - Tewksbury Town
(enumerated January 15, with information as of January 1)
Amos, head, 42, Mule Spinner in a Cotton Mill
Anna L., wife, 40, no occupation
He immigrated to the U.S. in 1892 and was naturalized in 1999.
He was born "At Sea" (!), and his parents in England.
She and her mother were born in Massachusetts, her father in Connecticut.
Living with them were Amos's four step-sons (presumably Anna's sons), all with the surname STILES and all born in Massachusetts. Their father was born in Vermont.
Walter H., 15, Helper in a Cotton Mill
William H., 11
Herman F., 9
Richard G., 7
Amos's household also included two boarders with no apparent connection to him.
There MAY be more information to follow.