To what two people or things is Momaday paying respect on his visit to Rainy Mountain?

It can be argued that Momaday is paying respect to his grandmother and to his native Kiowa culture on his visit to Rainy Mountain.
In the prologue, Momaday tells us that he returned to Rainy Mountain in July because he wanted to pay his respects at his grandmother's grave. Momaday's grandmother had passed away in the spring and was said to have lived to a very old age.
In the same prologue, Momaday pays homage to his grandmother's memory and the cultural heritage she bequeathed him. Aho (Momaday's grandmother) had belonged to the Kiowa tribe, a mountain people who eventually moved to the Plains. After leaving their traditional domain, the Kiowas acquired horses and adopted the sun religion of the Plains Indians.
Momaday relates that his grandmother always cherished her Kiowa heritage despite becoming a Christian in later life. It was his grandmother who shared stories of Sun Dances and buffalo sacrifices with him. She had grieved greatly when the Kiowa sun culture was destroyed in her youth.
The purpose of Momaday's visit is to pay respect to his grandmother's memory and the Kiowa cultural heritage she bequeathed him.