Answer and Explanation:
This question requires us to fill in the blanks with members of the family. It is missing the genitive case to indicate possession, but it is still understandable. The answers are:
1. Your mother's brother is your uncle.
2. Your father's mother is your grandmother.
3. Your sister is your mother's daughter.
4. Write four family members:
a. son
b. aunt
c. cousin
d. nephew
Even though the question is in English, you seem to be a Spanish speaker, so I'll leave the translations to help you out.
el hermano de tu madre es tu (uncle) - tío
la madre de tu padre es tu (grandmother) - abuela
tu hermana es la (daughter) - hija de tu madre
son - hijo
aunt - tía
cousin - primo; prima
nephew - sobrino