Indian Institute of Foreign Trade 2009 Solved Paper

In the first car - Raju's father, grandmother, mother and maternal grandfather - 4 members
In the second car - Raju's brother, sister-in-law, and brother-in-law - 3 members
In the third car - Raju, Raju's wife, sister-in-law, brother-in-law, daughter-in-law, grandson - 6 members
Total=(4+3+6)=13
Members not present - Raju's sister, sister-in-law's husband, brother-in-law's wife, son - 4 members.
Hence, option A is the correct answer.