M1 in 1851 to Elizabeth M. Hamilton (b:~1834, d:~1857). Issue:
1) James B. Crooks, 1852-1913
2) John W. Crooks, 1854-1895

M2 in 1857 to Charity Mullen. Issue:
1) George W. Crooks, 1859-1907

After William Crooks' death in 1862, the first 2 sons lived with their mother's family (Hamilton's) and moved to Humboldt Co, California.

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Company D, 16th Iowa Infantry.
Wounded in battle on 6-Apr, died of wounds on 9-Apr.

From Iowa Civil War Soldier Burial Records
Unit: IA 16 Inf D
Birth Information: IN
Death Information: 09 Apr 1862 Shiloh TN
Cemetery: Shiloh National
Cemetery Location: Pittsburg Landing TN
Comments: Enl 11 Nov 1861 as 2nd Sgt age 31 res Boonsboro; muster 11 Dec 1862; wounded 06 Apr 1862 Shiloh TN; died of wounds; s/o Jacob & Hannah Croy Crooks; GAR Post #329 in Boone IA named in his honor; brother George W of IA 10 Inf.
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Iowa Civil War Soldier Burial Records:
Name: William C Crooks
Rank: Private
Unit: IA 16 Inf D
Birth Information: IN
Death Information: 09 Apr 1862 Shiloh TN
Cemetery: Shiloh National
Cemetery Location: Pittsburg Landing TN
Comments: Enl 11 Nov 1861 as 2nd Sgt age 31 res Boonsboro; muster 11 Dec 1862; wounded 06 Apr 1862 Shiloh TN; died of wounds; s/o Jacob & Hannah Croy Crooks; GAR Post in Boone IA named in his honor; brother George W of IA 10 Inf.
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No marker found, believed to be buried as "unknown".

A gr-gr-grandaughter in Ukiah CA once reported "the auxiliary society moved his body to Linwood about 1869.", but this is unconfirmed (Linwood Cem in Boone Co, IA). That auxiliary society was likely the Woman's Relief Corps that was part of the W C Crooks GAR Post 329 of Boone Co, IA. It was called the W. C. Crooks Corps, No. 18, WRC. A later history - the 1914 History of Boone County Vol 1 - it says he was buried upon the battlefield.