1900 Alpin (Perry) AR Census
Robert M Bull, Mar 1871, MS GA MS, married 8 years, farmer
Martha A Bull, Aug 1873, AR AR AR, 4 children born, 3 living
Sarah Bull, Jan 1893, AR MS AR
Rosa Bull, Apr 1897, AR MS AR
John Bull, Apr 1900, AR MS AR

1900 Maumelle (Perry) AR
William F Bull, Apr 1833, AL SC SC, married 48 years
Matilda Bull, Aug 1835, NC NC NC, 16 children born, 7 living
Emma Bull, May 1894, AR AL NC

1880 Gap (Montgomery) AR Census
William F Bull, 45 AL SC SC, farmer
Matilda Bull, 42 SC SC SC
Jasper? Bull, 16 MS AL SC
George W Bull, 13 or 15 MS AL SC
Robert M Bull, 9 MS AL SC
Rosetta Bull, 6 MS AL SC
Sarah A Bull, 4 MS AL SC
Richard G Bull, 11/12 (Aug), AR AL SC

1870 (Attala) MS Census
W Foster Bull, 32 AL
Matilda Bull, 25 AL
Mary E Bull, 8 MS
Jno H Bull, 6 MS
George W Bull, 4 MS

1860 (Marion) AL Census
William F Bull, 18, AL - could be him based on 1900 census
living with:
James M Hall, 51 NC
Susan Hall, 48 SC
plus children

There are a couple of family trees for this line on Ancestry.

Hope some of this helps. Good luck.