On 1900 census Chickasaw Nation, Indian Territory, Benajamin has more then six sons, and last three children areborn in the IT, so they moved there a few years before 1900.And, his mother is living with them.Elizabeth Moore b Jan 1830, wid, b MS, NC, SC
1880 census Milam Co, TX:
Category: Name;Relationship to head of household; Marital Status; Gender; Race; Age; Birthplace; Occupation; Father's Birthplace; Mother's Birthplace.
Benjamin MOORESelfSMaleW23TXFarmerMSMS Galley MOORESisterMFemaleW18TXKeeping HouseMSMS Rebecca MOORESisterFemaleW16TXAt HomeMSMS Elizabetts MOOREMotherFemaleW51MSHouse KeeperNCSC Jesse B. PHILIPSOtherSMaleW25TXFarm LaborerILKY
1870 census Burleson Co, TX:
Moore, Elizabeth, 40, b MS - no land/personal 150 " Alison C., 18, b MS, no land/personal 330 " Barnabus (?), 16, b TX " Benj. H., 14, b TX " Sally Ann, 9, b TX " Rebecca E., 6, b TX
1860 census Milam Co, TX:
Moore, J.B., 32, b MS - land 897/personal blank " Elizabeth, 31, b MS " Mary Jane, 11, b MS " Custis or Curtis?, 9, b MS " Barnabus, 7, b TX " Benj., 5, b TX " Wm., 1, b TX
Since J.B. owns land, you might check land records in Milam Co, TX, see if he shows up with more then just initials.
This family should be on the 1850 census in MS, I do not have access to 1850 index online at home.