Question

'A # B' means 'A is the father of B'. 'A @ B' means 'A is the sister of B'. 'A & B' means 'A is the son of B'. 'A % B' means 'A is the mother-in-law of B'. If L & M, N % M, O # P @ K # L, then how is P related to M?

A Sister
B Mother
C Sister-in-law
D Spouse
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