I Am Starting a Search for Browns IN the Osage Indian Tribe of Oklahom

I am starting a search For Browns in the osage indian Tribe of Oklahoma. I dont have a lot of info. All i know is that my grandmothers, mothers name was Daisy Elizabeth Brown. She Married Donald E Marshall. My grandmother is Phyllis Marshall. i know this is vague, but any help in pointing me in the right direction wouls help.