Hi. I'm trying to help a relative locate the birth parents of his ancestor, Ernesto Martinez born circa 1898 in Texas.

Ernesto was born to Native American parents and adopted by parents born in Mexico. The 1940 Census shows he was living in Williamson, Texas with his wife Josepha and children.

How can we go about obtaining the birth records? Could the current direct line descendant present a petition to obtain the records and if so how?

Any direction and pointers welcome as well as recommended sources for further guidance.