'B & D' means 'B is the father of D',
B × D' means 'B is the husband of D',
'B # D' means 'B is the brother of D',
'B $ D' means 'B is the wife of D',
'B @ D' means 'B is the mother-in-law of D',
then how is A related to K in the following expression? A×B C$D#E&K