In response to your inquiry, about 16 years ago(!), I'll offer this: my mom, Beverly Cottom Dietz, was born in South Dakota and her mother's name was Hazel. After her first husband's death, Hazel married Walter Willoughby. He's the guy I knew as "grandpa." I went fishing with him; he had an irrigated farm in Moiese. After his death, Hazel lived in Ronan.
She had a daughter and son, Beverly and Walter Dean, by her first husband, and two daughters, Naida, and Connie, by her second.
It has always been extremely difficult to find information about this side of the family; my mom never seemed to have happy memories of childhood.
Are you, by chance, a distant or not-so-distant relative?