These questions are based on the following information.
(i) ′A×B′ means 'A is the mother of B'.
(ii) ′A÷B′ means 'A is the brother of B'.
(iii) ′A+B′ means 'A is the son of B'.
(iv) ′A−B′ means 'A is the wife of B'.
In ′J−T÷K+F′, how is F related to J?