I'm wondering if Rachel and Sarah are connected to my Robert Crowell born about 1810. He was the husband of Harriett Amelia Davidson. In the 1891 census in Windsor, NS Lucy Isabella Spencer age 3 is listed as the daughter of Harriett Crowell (Davidson). She is clearly not the mother, but maybe an Aunt?
Lucy's parents are John Alexander Spencer and Mary Julia Bishop. As shown on her birth record.
https://familysearch.org/ark:/61903/1:1:QVRF-LKKSJohn is the son of Edward Spencer and Rachel Crowell.