More Information:

About the Joseph Daniel Ferguson Family:

Marriage date from Ancestry.com Missouri Marriages to 1850.

About Joseph Daniel Ferguson:

Found in 1850 Census, MO, Osage Co., Benton TS, p. 457:
Joseph D. Fergusson 34 Farmer VA
Elizabeth Fergusson 26 MO
James Fergusson 4
John Fergusson 2

This is Joseph Daniel Ferguson, since he is found with the same family in the 1860 Census named Daniel Ferguson (Furgurson). Mother Rachel and brother William B. living nearby.
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Found in 1860 Census, MO, Osage Co., Benton TS, p. 191:
Daniel Furgurson 45 Farmer VA
Elizabeth Fergurson 35 MO
James Fergurson 14 MO
John L. Fergurson 12 MO
Georg C. Fergurson 10 MO
Harriett E. Fergurson 8 MO
Samuel Fergurson 6 MO

They were living very close to Joseph, Martin, James O., and Nancy Ferguson. I am assuming that this Daniel is Joseph Daniel.
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About Elizabeth Ann Laughlin:

Maiden name, dates from Mormons site.

Name given as "Harriet Anne" on Samuel Ferguson death certificate.

About James Ferguson:

Name and birth date and place from 1850 and 1860 Census.

About George C. Ferguson:

Name and birth date and place from 1860 Census.

About Harriett E. Ferguson:

Name and birth date and place from 1860 Census.