Check whether the given phrase is a well-defined set or not.

“The people in your immediate family (father, mother, sisters and brothers).”

Q. Statements:
All Fathers are Brothers.
Some Daughters are not Brothers.
Some Mothers are Daughters.
All Sisters are Brothers.
No Father is a Mother.

Conclusion:
I. Some Daughters are not Mothers.
II. Some Mothers are not Sisters.

Q. Statements:
All Fathers are Brothers.
Some Daughters are not Brothers.
Some Mothers are Daughters.
All Sisters are Brothers.
No Father is a Mother.

Conclusion:
I. All Brothers, if they are Mothers, are also necessarily Fathers.
II. Some Brothers that are not Mothers are also not Sisters.

Q. Statements:
All Fathers are Brothers.
Some daughters are not Brothers.
Some Mothers are Daughters.
All Sisters are Brothers.
No Father is a Mother.

Conclusion:
I. some Daughters are not Fathers.
II. Some Daughters that are not Sisters can be Mothers.

Q. Fill in the blank with the most appropriate word.
I have a father, a mother, a grandfather, three brothers and two sisters. ___ my family.

Q. In a family of six, C is the sister of F, B is the brother of E's husband, D is the father of A and grandfather of F. There are two fathers and three brothers in the family.
Who is C's mother?