In the question given below, three statements are given followed by two conclusions I and II. You have to consider the statements to be true even they seem to be at variance from commonly known facts. You have to decide which of the given conclusions, if any follow from the given statements.

Statements:

Some brothers are fathers.

No father is a mother.

Some mothers are sisters.

Conclusions:

I. No sister is father.

II. Some sisters are fathers.