My grandmother's aunt, Viola Ann Jones, married Andrew Jackson "Jack" Yandell. They had Fleetwood, Cleo, and Jones.

Viola's cousin Millie Jane Griffith married Jack's brother Robert Lee Yandell. They had Ruby, Milo, Wilton, Johnny, and Florine.

Both Jack and Robert were brothers of your William.
William married (1) Janie Williams:

Yandell, William 17 of Waldron to Miss Jane Williams 15 of Sugar Grove, Logan County, by J. A. Wilkins, J. P. on 20 December 1885. Scott County Marriage Book A., Page 257.

He married (2) Eliza:

Yandell, W. A. 26 of Braggs, Indian Territory to Miss Eliza Elmima Litteral 16 of Greenridge on 25 April 1894 by E.D. Yandell, County Judge. Scott County Marriage Book B., Page 215.

Other than Williams death in 1896 in Van Buren, Arkansas - I have no further info on him.

However, I do know his parents, Judge Edmond Dallas Yandell and Priscilla Cooper, are buried at Mt. Pleasant Cemetery in Scott County, Arkansas. I have photo's of their markers if you want them.