In a three-generation family of eight persons there is three married couple. M is the only daughter-in-law of V. J has two children and he has one sibling. S is daughter of L who is parent of J. S is sister-in-law of M and is unmarried. U is nephew of S. T is sister-in-law of R who has no siblings. V is not a mother of J.

Four of the following five are alike in a certain way and hence form a group. Find the one who doesn’t belong to the group?

The correct option is J.

Step 1: Analyze the family details

• Total family members = 8
• Number of generations = 3
• Number of married couples = 3

Step 2: Decode the clues and reconstruct the family tree

1. "S is daughter of L who is parent of J."
This means L has at least two children: S (female) and J.

2. "J has two children and he has one sibling."
J is male (since "he" is used). J's only sibling is S (female). Since S is unmarried, J must be married and have two children.

3. "M is the only daughter-in-law of V." and "S is sister-in-law of M and is unmarried."
Since S is J's sister and S is unmarried, S's sister-in-law M must be married to J. So, J and M are a married couple (J is husband, M is wife). M is the daughter-in-law of V, which means V is a parent of J.

4. "V is not a mother of J."
Since L and V are both parents of J and S, and V is not the mother, V must be the father (male) and L must be the mother (female). Thus, L and V are a married couple in Generation 1.

5. "U is nephew of S."
S's brother is J. So U must be a son (male) of J and M.

6. "T is sister-in-law of R who has no siblings." and "J has two children."
J and M have two children in Generation 3. We know one child is U (male). The remaining two members in the 8-member family are R and T. Since there are 3 married couples in total (Generation 1: V & L, Generation 2: J & M), the 3rd married couple must be in Generation 3 among J's children. Since R has no siblings of their own, R is married to one of J's children. For T to be the sister-in-law of R without R having siblings, T must be R's sister-in-law through marriage, meaning T is the child of J and M (sister of U), and R is married to U.

Thus, the third married couple is U (male) and R (female), and T (female) is U's sister (hence R's sister-in-law).

Step 3: Determine the gender of each person

• L: Female (Mother of J and S)
• V: Male (Father of J and S)
• S: Female (Daughter of L and V)
• J: Male (Son of L and V)
• M: Female (Wife of J)
• U: Male (Son of J and M)
• T: Female (Daughter of J and M)
• R: Female (Wife of U)

Step 4: Identify the odd one out

Let's look at the given options based on gender:
• L is female.
• S is female.
• R is female.
• J is male.

Out of the four options (L, S, R, J), three are female (L, S, R), while J is the only male. Therefore, J does not belong to the group.