I am not related to the Crenshaws, but in my notes on Brazos County history I have a few bits of information on some people of that name.
I hope this helps.
1866: Jan. 1 -- H.P. EDWARDS & his wife Mary EDWARDS sold W.L. CRENSHAW & Co. of Grimes Co. the east part of lot 2 in block 5 in the town of Millican. Brazos Co. Deed Records, Book G, p. 478
[ad] W.L. CRENSHAW & Co., forwarding and commission merchants, dealers in dry goods and groceries, Millican, Texas. W.L. CRENSHAW, Elisha FLOYD. (Houston) Tri Weekly Telegraph, 20 Apr. 1866, p. 4.
Registered at the Washington Hotel in Galveston: J.D. IMBODEN, W.L. CRENSHAW, Millican. Galveston Daily News, 8 May 1866, p.2
1867: July 24 -- The firm consisting of W.L. CRENSHAW of Brazos Co. and Elisha FLOYD of Grimes Co., doing business in the town of Millican, is dissolved; the whole interest in the firm is transferred to W.L. CRENSHAW, including the east Â½ of lot 2 in block 5 in Millican; witness: J.M. FINLEY. Brazos Co. Deed Records, Book I, p.102
1868: Apr. 22 -- W.L. CRENSHAW & his wife Anna M. CRENSHAW and Elisha FLOYD & his wife R. Ann FLOYD sold James FAGAN the east part of lot 2 in block 5 in Millican. Brazos Co. Deed Records, Book I, p.145
1868: June -- W.L. CRENSHAW vs. Town of Millican, in Brazos Co. County Court Record Book A, p.63 -- original book missing, known only because it is listed in the Index to County Court Minutes, 1867-1915, microfilm copy of index at Texas A&M University as reel 1020038.
1873: Sept. 10 -- Nathaniel GERMAN married Francis L. CRENSHAW; A.G. PREWITT J.P. B.C. performed the service at Millican. Brazos County Marriage Records, Book D, p.480
1877: Dec. 20 -- Mr. B.F. HARRINGTON married Miss Alice CRENSHAW; L.B. ALDRIDGE, J.P. B.C. performed the service at Millican. Brazos County Marriage Records, Book D, p.426
CRENSHAW, ---, died. Mathew & Wiley P. CRENSHAW, minors, probate case 650 filed 28 Sept.1900
CRENSHAW, --- (child); funeral held at Wesson Chapel on 3 July 1896; child of Joe CRENSHAW. South Diary, file 1-36.
CRENSHAW, --- (child); â€œlittleâ€ daughter of Mr. & Mrs. W.T. CRENSHAW; niece of Clark WYATT; buried at Bethel. (weekly) Bryan Eagle, 9 Aug.1900, p.6, col.2
CRENSHAW, Harriet; she was buried on 18 Aug.1882. South Diary, file 1-25.
CRENSHAW, S.P., Mr.; died at his home on Spring Creek; lived in Brazos County 20 or 25 years; left wife & several children. (weekly) Bryan Eagle, 28 Oct.1897, p.3, col.4.
THOMPSON, Mattie, Mrs.; Aged 31; wife of I.F. THOMPSON of Holligan; buried at Steep Hollow; left husband & 5 children; left sister Mrs. Mary GRAVES of Center & brother Rev. W.N. CRENSHAW of Iola; Mr. G.B. RISINGER of Village Mills was Â½ brother. (weekly) Bryan Eagle, 12 Apr.1900, p.6, col.4