1830 St. Francois Co MO, Pendleton Twp, p.421. Wilson Brown. 1m -5, 1m 20-30 [Wilson], 1f -5, 1f 10-30 [first wife] These two older children are unidentified.
1840, Searcy Co AR, p.183. Wilson Brown. 3m -5 [John, Samuel & Solomon], 1m 5-10 [William J.], 1m 10-15, 1m 30-40 [Wilson]. 1f 5-10, 1f 30-40. It would appear Wilson's first wife was living in 1840 - there are at least two older children who have not been identified.
1850 Searcy Co AR Census, Tomahawk Twp, p.170-1, Household 100. Wilson Brown age 41, b. SC. Mary Ann, age 29 [probably 2nd wife]; William J. age 17, b. MO. Remainder of children born in Arkansas: Solomon J. age 14, Samuel S. 12, John O. 11, Sarah Ann 9, Joseph 7, and Olive J. 2. Also Elisabeth Jones age 5 [possibly a child of Mary Ann's from a former marriage.]
Mary Ann was obviously a 2nd wife given the ages of the children. Nothing is known about the first wife. Mary Ann may also have been the widow Jones when she married Wilson Brown. A 5 year old child, Elisabeth Jones, was living with them in 1850 and I would think she was Mary Ann's child. Also the only gap in the ages of Wilson Brown's children is between Joseph age 7 and Olive age 2 - I would suppose his first wife died after the birth of Joseph and Olive is the only child of Wilson and Mary Ann born by 1850.
Solomon Jones lived first in St. Francois Co MO, then in Searcy Co AR. He came to St. Francois from TN. In 1830 Elisha & Solomon Jones were on the same page of the St. Francois census. Given the name of the child Solomon J., it's possible Wilson's first wife was a daughter of Solomon Jones. I suspect the 2nd wife Mary Ann as being the widow Jones when she married Wilson.
I did not find Wilson or a widow Mary Brown in Searcy Co in 1860 - only the sons Solomon and possibly John.
I suspect only Olive J. is a child of Mary Ann and Wilson. I think the other children are from a first wife.
Wilson BROWN and Mary Ann [BROWN] had the following children: