‘B & D’ means ‘B is the brother of D’.

'B × D’ means ‘B is the mother of D’.

‘B # D’ means ‘B is the wife of D’.

‘B $ D’ means ‘B is the son of D’.

‘B @ D’ means ‘B is the mother of D’.

How is B related to G in the following expression?

A B # F $ C @ E # G

Wife’s brother’s wife

Please note;

     ⇒ Circle shown as "Female".

 =  ⇒ Double lines shown "Married Couple" .

     ⇒ Vertical line shown "Difference of a generation".

     ⇒ Square box shown as " Male".

 -   ⇒ Single line shown " Siblings".

Thus, from the above chart we an see that B is wife's brother's wife of G.