If ‘M = N’ means ‘M is the father of N’, ‘M # N’ means ‘M is the sister’s son…

If

‘M = N’ means ‘M is the father of N’,

‘M # N’ means ‘M is the sister’s son of N’,

'M × N’ means ‘M is the husband of N’,

‘M & N’ means ‘M is the sister of N’,

‘M $ N’ means ‘M is the wife of N’, and

‘M @ N’ means ‘M is the brother of N’,

then how is A related to C in the following expression?

A # L = K & P @ C = B