How can i find any relatives of mattson that was married into native american clan,what generation mary cloud?

i do know that morris mattson is the husband of mary cloud. mary cloud mother is good owl and father hollow bear. i need more information on this can some one please help? pretty owl is a grandmother of mary cloud but not much information on her at all. i would like to know the rest of my father family and connect with my relations like family should. i know enoch mattson is morris mattson and mary cloud son. plus i am trying to find more out on elsie mcclain family who married a native american also.can anyone help? i don't know how to cross reference from back then. by finding who is my relations so i know either way of how much native blood i have in me. a friend told me i did have native american in me off the side of my mother.but i would have to find it and i can't. i need help i don't know nothing on this at all. but i need to know.