At the Onieda Co. Courthouse I found:
Donaldson, Leona Cora, born Mar 7, 1876 in Huron Co., Ohio; died Mar 18, 1962 in Rhinelander, Onieda, WI. Father was S. H. Cole, mother was A. E. Taintor.
Onieda County Death Records Vol. M, page 524
Donaldson, Carl Howe, born Jan 21, 1875 in Iowa; died Mar 3, 1917 in Rhinelander, Onieda, WI. Father was Edson B. Donaldson, mother was Abbie C. Bourne.
Onieda Co. Death Records Vol. A, page 1057
Donaldson, Harry James, born July 23, 1904 in Illinois; died Feb 4, 1979 in Dane Co., WI. Father was Sam Donaldson, mother was Emma Flagel. Informant was Lillian M. Donaldson (probably wife). SS# 339031261
Onieda Co. death Records Vol. Y, page 465 (Don't know of this is a relation or not, that's your problem)
Heisman, Edith Cora, born Sept 25, 1869 in Huron Co., Ohio; died Nov 19, 1963 in Rhinelander, Onieda, WI. Father was Hewitt Cole, mother was Ascha Taintor. Husband was John Heisman (THE John Heisman). SS# 396445407
Onieda Co. Death Record Vol. O, page 99.
No marriage records, ran out of time to check births, sorry. Will try to do that another day.