Thank you for raising this question. I see this comment from https://www.wikitree.com/wiki/Howland-908
The identity of Abraham Howland's wife presented a problem because the early genealogists suggested that Abraham Howland was married twice. They thought that there were two different separate women who married him.
For example, in 1883, William T. Davis wrote that Abraham Howland married Ann, daughter of Nathaniel Colson.[1] In 1885, Franklyn Howland wrote that Abraham Howland married Ann, daughter of Nathaniel Colson, of Newport, Rhode Island, but he added, “If so, she could not have lived, as other records say he married Annie Rouse, who was probably the mother of most of his children, as his first son was named Rouse.”[2]
The research suggests that it remains unknown whether Abraham Howland ever married once or twice. One may wonder whether the two names were referred to the same woman to whom Abraham Howland married once was an Ann Rouse Colson. Which children were from Annie Rouse or Ann Colson remains unknown even if they were two different separate women. Some genealogists believe that all children came from Annie Rouse.[3]
2. Howland, Franklyn, A Brief Genealogical and Biographical History of Arthur, Henry, and John Howland and Their Descendants, of the United States and Canada: Together with an Account of the Efforts Made in England to Learn of Their English Ancestry, Etc.. New Bedford, Mass.: Howland, 1885, p. 85.
3. Robert S. Wakefield and Robert M. Sherman, National Genealogical Society Quarterly (Dec 1987) Vol 75, 283.
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Do you have more citations for the children of John Rouse, II and Elizabeth Carver ?