In a certain code language,
‘M & N’ means ‘M is the mother of N’

‘M @ N’ means ‘M is the son of N’,

‘M # N’ means ‘M is the daughter of N’.

Based on the above, how is L related to O if ‘K & L & M # N @ O’?

Let's decode the given relationship sequence systematically step-by-step:
K & L: K is the mother of L.

L & M: L is the mother of M (L is Female).

M # N: M is the daughter of N (M is Female). Since L is already known to be the mother of M, N must be the father of M. Therefore, L and N are married (L is the wife, N is the husband).

N @ O: N is the son of O.

Now, let's look at the relationship between L and O:

N is the son of O.

L is the wife of N.

Therefore, L is the Son's wife (daughter-in-law) of O.