Verbal Reasoning - Mental Ability Questions

In a family, there are six members A, B, C, D, E and F. 

A and B are a married couple, A being the male member. D is the only son of C, who is the brother of A. E is the sister of D. B is the daughter-in-law of F, whose husband has died. How is F related to A ? 

Select the related number from the given alternatives.

5 : -10 :: -8 : ?

Which of the following terms follows the trend of the given list?

RSPQPQPQ, PSRQPQPQ, PQRSPQPQ, PQPSRQPQ, PQPQRSPQ, _______________.

Select the related word/letters/number from the given alternatives.

Paw:Cat::Hoof:?

Select the related letters from the given alternatives.

IJK : RQP :: TUV : ?

Select the related word/letters/numbers from the given alternatives:

FED : IHG :: ? : ?

Which of the following terms follows the trend of the given list?

QRPQPQPQP, QPRQPQPQP, QPQRPQPQP, QPQPRQPQP, QPQPQRPQP, _______________.