Uncle Frank in Los Angeles,CA

Jackson, Mathis Mathews, Mathias,Collins Johnson. We have cherokee Heriatiage. On the Mathis side, and I also know that My Grandmother Collins Was Indian,however my family is very hush hush about it. My family comes from Oklahoma, Tenn. Texas, Ark., Ca.,Georgia, and I have extensive research on my mother's part of my family (Mathis) However my fathers side (Jackson) It is very difficult, due to my family not willing to tell me very much. Any help will be appreciated.