TX Dth Idx thru 1976 shows Mr. Cade is named William and born in LA. But further research shows LA may be wrong??
Name: Edith Cade Findlay Death Date: 24 Apr 1935 Death Place: Galveston, Galveston Co., Texas Gender: Female Race: W Death Age: 70 years 8 months 6 days Estimated Birth Date: Birth Date: 18 Aug 1864 Birthplace: Liberty, Texas Marital Status: Widowed Spouse's Name: James Findlay Father's Name: William Cade Father's Birthplace: La. Mother's Name: Elizabeth Branch Mother's Birthplace: Texas Occupation: Place of Residence: Cemetery: Burial Place: San Antonio, Texas Burial Date: 25 Apr 1935 Additional Relatives: Film Number: 2116469 Digital Film Number: 4030351 Image Number: 200 Reference Number: 18487 [Informant: Mrs. Marvin Kennedy, maybe a married dauther?]
Janet is on the 1930 census Galveston Co, TX as wife of Marvin Kennedy.
1860 census Liberty Co, TX page 311:
Cade, S.M., 25 (male) b AL - land 3000/personal 300 Cade, Wm. J., 23, b MS - land 3000/personal 300 [this might be your William Cade]
Cade, J.M., 50, b GA - land 2200/personal 8000 [slaves?] De Blanc, Jerome,Jr, 21, b LA - no land/personal 2500
J.M. is a Physician and Jerome is an "overseer" which usually means slaves.
On Rootswebs WorldConnect site -- http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgihttp://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi -- I played around a bit and J.M. is John M. Cade b GA, and died in Liberty Co, TX, is listed as father of William and Samuel. I would get in touch with submitters they have more to share with you.