You should give some dates, or even approximate dates, for those in your query. I figured they went to TX after the Civil War, so looked at the 1880 census.
1880 census Kaufman Co, TX:
Category: Name;Relationship to head of household; Marital Status; Gender; Race; Age; Birthplace; Occupation; Father's Birthplace; Mother's Birthplace.
John F. TOOTHMANSelfMMaleW40VAFarmerVAVA
Ada A. TOOTHMANWifeMFemaleW33IAKeeps HouseOHOH
Dora N. TOOTHMANDauSFemaleW13TXAt SchoolVAIA
Fred TOOTHMANSonSMaleW11TXAt SchoolVAIA
By 1900 Ada, now listed as Iowa A. is living with her married daughter Dora. And, if the census is correct Dora is the only living child she has at that time.
Reynolds, Richd R., h, b Jan 1860, 40, M 12 yrs, b TN,TN,TN
" Dora N., w, b Nov 1866, 3, M 12 yrs, 6 ch, 5 lvg, b TX, IA, IA
" Fred C., s, b Apr 1890, 10, b TX
" Hendley S., s, b Jan 1892, 8, b TX
" Mabel, d, b Apr 1894, 6, b TX
" Richd Jrs, s, b May 1896, 4, b TX
" Jno T., s, b Ma 1899, 1, b TX
Toothman, Iowa A., mth-in-law, b Aug 1846, wd, 3 ch, 1 lvg, b IA, IA, IA
Not my line
Happy Hunting (^_^)