The sentence "Ella cuida a sus hermanos" is grammatically CORRECT.
Here's why:
1. In Spanish, the subject "Ella" (she) matches the verb "cuida" (takes care of) in terms of gender and number.
2. The preposition "a" is used before "sus hermanos" (her brothers) to indicate that the action of taking care is directed towards them. This is a common structure in Spanish when talking about looking after someone.
3. The possessive pronoun "sus" (her) agrees in gender and number with "hermanos" (brothers).
Overall, the sentence is correctly structured and conveys the idea that she takes care of her brothers.
