David married Maria Reeves on May 30, 1857 in Marden, Kent, England. They are the parents of Mary Maynard, Hannah, Eliza, Harriet Sarah, John David, Stephen, Thomas Heber, George Albert & Alice Savina.
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From the LeMars Sentinel, Friday, February 25, 1916, Page 1, Column1:

DAVID OSBORNE DEAD

DECEASED A PIONEER SETTLER NEAR SENEY

LIVED HERE FORTY-SEVEN YEARS

Was a Native of Kent, England, Where He Was Born in 1837--

He Leaves Six Children and Many Grandchildren and Great-Grandchildren

David Osborne, a pioneer of this section of the country, died at his hime (sic--home) in Sherman township, Sioux county yesterday morning shortly after one o'clock. His death was due to hardening of the arteries and heart trouble. He was nearly eighty years of age. Mr. Osborne was a native of Kent, England, where he was born on September 5, 1837 (error--actually 1836). He grew to manhood and was married in England to Miss Maria Reeves and in 1869 came to America and shortly after located north of Seney, where he made his home with his sons living three quarters of a mile from the Plymouth county line.

Mr. Osborne is survived by six children: John Osborne, living in Fredonia township; Thomas, Steven and George, in Sherman township, Sioux county; Mrs. Geo. Reeves, Mission Hill, S. D.; and Mrs. F. J. Claydon, of [Mc]Minnville, Oregon. Three children and his wife have preceded him in death. There are also twenty-eight grandchildren and thirteen great grandchildren.

The funeral services will be held on Saturday at 10:30 in the Seney church, Rev. H. V. Comin, pastor of the First Presbyterian church officiating, and the remains will be interred in the LeMars cemetery.

Mr. Osborne was a fine man and a good citizen who enjoyed the respect and esteem of all who knew him. He was a loving husband and father, a good neighbor and friend, and in his death the community loses one of the men who were intrumental in building up the life and progress of the northwest prairie.