Correspondence with family members including cousins, aunts, and uncles. There is also correspondence with Earl's sister Ida, but not on a regular basis. Ida Douglass Battin and her husband lived on a homestead in Iroquois, South Dakota. Earl visited Ida occasionally and boarded with them when he was a student at South Dakota Agricultural College and teaching school in the area.

Correspondence to Earl from relatives including his sister Ida Battin, Ida's children, and her husband Alfred. There are also letters from cousins, nieces, and nephews.

Letters from relatives of Earl Douglass in South Dakota and Minnesota.

Letters to Earl Douglass from relatives in Minnesota expressing strong family ties and interests.

One letter from Pearl's mother, Charlotte Goetschius, relating family events in Alder, Montana, and letters from Pearl's brothers Grover and Frank Goetschius.

One letter from Pearl's mother (10 April 1914) and letters from other relatives.

Many of the letters in early 1923 comment on Nettie's stroke which left her helpless. Relatives on both sides seemed concerned. Several letters from Earl to relatives reported on Netter's condition. Nettie died 23 March 1923. Letters from Earl in 1924 tell of Pearl's poor health and her need to spend some time at a lower altitude. Pearl went to California in 1924.

Correspondence between Earl and Pearl Douglass and relatives (nieces, nephews, aunts, and uncles).

Letters from Earl to his son Gawin and Grover Goetschius, a brother of Pearl Douglass, living on the family farm in Montana. Douglass wrote of the possibility of striking oil on some of their (Earl's, Pearl's, and Grover's) holdings in the Uinta Basin, "But don't get too hilarious for all things are uncertain and one of the most uncertain of them all is the oil game the way it is played."

A letter from Charlotte Goetschius to her daughter Pearl, 25 September.