Samuel and Sarah (Holden) Hartwell’s children Mary and Levi are not given in the Hartwell Genealogy89 but are reported for this couple in Shattuck’s Memorials100, which omits the daughter Lois (with same birthdate as Levi; perhaps they were twins, or perhaps Levi is an error for Lois). The Hartwell Genealogy does say that Samuel and Sarah (Holden) Hartwell “settled in the northern part of Groton, near the Nashua river, and had two children who died in infancy.”101 Whether this means two children in addition to those listed, or that two of the listed children died in infancy, is not clear.