Jessica Alba is investigating her family tree…

The 33-year-old half-Mexican American actress explores her Mexican heritage in a new episode of Finding Your Roots, a PBS series that explores geneology and identity.

The episode features Alba and her Mexican American father, Mark Alba, looking through photos and documents related to her ancestors.

In the episode, Alba learns that her great-grandfather was instrumental in creating a school in Claremont, California for Mexican migrant children, after not wanting his own children to fall behind in education.

Alba herself discusses family stories, including the prejudice her family faced — siblings from her grandmother’s light-skinned family were allowed to go to “white” schools, while her darker-skinned family members were forced to attend “Mexican” schools.

Check PBS local listings for more information and visit PBS.org.

Click here for a sneak peek by watching the clip below!