Discussion

Explanation:

It is given that Mr. Raju’s father’s mother, mother’s father and their children were in one car.

∴ His paternal grandmother, maternal grandfather, Mother and Father were in the first car.

Mr. Raju’s father’s son, sister’s husband and brother’s wife were in the second car.

Raju’s father’s son has to be his brother as Raju himself was in the third car.

∴ Raju’s brother, Brother-in-law (sister’s husband) and sister-in-law (brother’s wife) were in the second car.

Mr. Raju, his wife, wife’s sister, wife’s brother, son’s wife with a kid were in the third car.

∴ Mr. Raju, his wife, sister-in-law (wife’s sister), brother-in-law (wife’s brother), son’s wife and grandson were in the third car.

∴ Car 1: Paternal Grandmother, Maternal Grandfather, Mother and Father.

Car 2: Brother, Sister-in-law (brother’s wife) and Brother-in-law (sister’s husband).

Car 3: Raju, his wife, Sister-in-law (wife’s sister), Brother-in-law (wife’s brother), Son’s wife and Grandson.

∴ 13 members of Raju’s family were there in the picnic and 4 members i.e. Raju’s Sister, his wife’s brother-in-law, his wife’s sister-in-law and his son were left behind.

Hence, option (a).

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