Verbal Reasoning - Mental Ability Questions

P is the brother of Q. Q is the brother of R. P is the son of S. Based these three statements, much of the following statements cannot be definitely true?

In the following question, select the related word pair from the given alternatives. Lotus : Flower : : ? : ?

In a row, there are 6 boys between A and B and A being the first boy in row. There are 3 boys between B and C. If there are 12 boys after C, then how many minimum boys are there in the row?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

DM, EN, FO, ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

HI, MN, RS, ?

In the following question, from the given alternative words, select the word which cannot be formed using the letters of the given word.
Biological

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
Morning, Afternoon, Evening, ?

Select the related word/letters/numbers from the given alternatives: DBCE : QOPR :: JLKI : ?