About Constance A Eastland (Peterson)
In the census records with Fredrick, it states that Constance Eastland's parents were born in Sweden, and she was born in New Hampshire circa 1899.
I've only been able to find one Constance born around that time in New Hampshire with parents from Sweden, the Petersen family. Constance A Petersen was born in July 1898. Her brother Emel was also born in New Hampshire. The 1900 census lists Rutland, Vermont as the residence for that year. Conrad (middle child) was born in Vermont, so it looks like they traveled between the two states.
John G Petersen (40)
Anna C Petersen (34)
Emel A Petersen (7)
Conrad C Petersen (5)
Constance A Petersen (1)
I note that the middle initial of Constance Eastland is "P", but often the middle initial can be from the maiden name.
If anyone can confirm or deny this relationship, please send me a message.