In a certain code language, ‘A + B’ means ‘A is the mother of B’, ‘A − B’…

In a certain code language,

‘A + B’ means ‘A is the mother of B’,

‘A − B’ means ‘A is the brother of B’,

‘A × B’ means ‘A is the sister of B’, and

‘A ÷ B’ means ‘A is the husband of B’.

How is K related to L if ‘L + A − B ÷ K × G + F’?