Introducing a man to her husband, a woman said, "his brother's father is the only son of my grandfather."
How is the woman related to his man ?
A party consists of grandmother, father, mother, four sons and their wives and one son and two daughters to each of the sons.
How many females are there is all ?
A + B means A is the father of B ;
A - B means A is the wife of B ;
A x B means A is the brother of B ;
A ÷ B means A is the daughter of B.