family tree

I am trying to find out as much as I can about my family tree my gg great grandma Sara Avery married my gg grandpa john w franklin I was told she left the reservation to marry a white man they had a daughter Arvilla franklin born Feb. 8th 1881 died 4/7/1929 married Lesley ball on 10/31/1900 they had a daughter ona belle ball 4/22/1902 died 4/22/1979 married David Willard Castleberry on 3/16/1920 they had franklin Willard Castleberry on 12/6/1928 died 9/10/1993 he was my grandpa I was always told we were Cherokee I have hit a wall if anyone can help me prove my linage please reply also if u have any ideas about what else I can do please reply