Question

¿quién es beatriz? incluye el artículo definido.
martin flor
beatriz
beatriz es de martín y flor.

Explanation:

To answer this, we analyze the family tree. Martín and Flor are a couple (indicated by the ring), and Beatriz is connected below them, so she is their daughter. In Spanish, "the daughter" is "la hija". So we fill in "la hija" to complete the sentence "Beatriz es la hija de Martín y Flor."

Answer:

la hija