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"La madrastra" is a form of "madrastra", a noun which is often translated as "stepmother". "El padrastro" is a form of "padrastro", a noun which is often translated as "stepfather". Learn more about the difference between "la madrastra" and "el padrastro" below.
la madrastra(
mah
-
drahs
-
trah
)A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
a. stepmother
Este año voy a pasar la Navidad con mi papá y madrastra.I'm going to spend Christmas with my father and stepmother this year.
el padrastro(
pah
-
drahs
-
troh
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
a. stepfather
Al morir la madre, el padrastro se quedó con la custodia de la niña.The stepfather got custody of the child after her mother died.