Here are a few possible thesis statements for "Abuelito Who?":
Thesis 1 (Focusing on Identity):
> Leo learns that identity is not fixed but fluid, changing depending on the context and the roles we play in our lives.
Thesis 2 (Focusing on Family):
> "Abuelito Who?" celebrates the complex and loving bonds within families, even when they appear different on the surface.
Thesis 3 (Focusing on Cultural Heritage):
> Through his grandfather's diverse identities, Leo gains a greater understanding of his cultural heritage and the importance of honoring tradition.
The best thesis statement will depend on the specific focus of your analysis.