Fritz-Fausnacht/Morrison-Winter Family Tree

Ernest Elmer Zoppi
--Father: Henry Zoppi (born in California; race "Indian [Native
America]" on 1930 US census)
--Mother: Ruby Sandoval (born in XYZ: race "Indian" on 1930 US census)
I can't make out where Henry and Ruby and their parents were born.

I cannot find any more information on Henry Zoppi.

Ruby Sandoval's parents were Juan Pablo Sandoval and Savina Westgate.
I cannot find anything on Juan Pablo. (Sandoval is a Spanish surname,
and Juan Pablo are Spanish names.)
--Savina Westgate's father (Frances Westgate) is from the United
Kingdom. His parents are also from the UK,
--Her mother, Soledad Briones, was born in Mission Dolores, San
Francisco, California. Soledad's parents...unknown. (Birones may be
a Spanish surname.)
--Savina Westgate was buried at as "Indian cemetery" in Tomales, Marin
County, California.

Tomales was founded by 1854, which is when the first post office was
opened. Before Europeans settled here, it was hom to the Coast Miwok
tribe. Savina was born in 1863, and her mother, Soledad, was born in
1828. It's possible that Soledad was part of the Coast Miwok native
Americans. Before California owned their land, Mexico owned it (up to
about 1863).

I don't know if there is any Coast Mikow in Grandpa Zoppi's ancestry,
on his mother's side, but it's possible. I also don't anything about
his father's side. If Henry Zoppi was Native American (or had a
Native American mother), it might be likely that they were not
included in censuses due to living in Native American villages.