Hi, I think the reason why you are having a hard time tracing Andrew J O'Fallon, is because he changed the name to O'Fallin. At least that's what my Father has told me. My name is James O'Fallin, my Fathers name is Teddy Andrew O'Fallin, and my Grandfather was Jessie James O'Fallin. His Father was Andrew J O'Fallin. Here is list of who his wife was and children.
ID: I1838
Name: Jesse James O'FALLIN
Sex: M
Birth: MAR 0889 in Crosset, Ashley Co., AR
Death: ABT 1958
Change Date: 11 MAR 1998
Father: Andrew J. O'FALLIN
Mother: Isabella HAYNES
Marriage 1 Addie GRAY b: 2 MAY 1893 in Crossett, Ashley Co., AR
Children
Minnie O'FALLIN b: 21 FEB 1917 in Crossett, Ashley Co., Ar
I hope this help you and I guess we are family, what do you know!
Sincerely,
James O'Fallin