If my sister's mother-in-law's only son is Devika's father, how is Devika's paternal grandfather related to my sister?
Father-in-law
Let's break down the blood relation question step by step to determine the relationship between Devika's paternal grandfather and my sister.
Analyzing the Blood Relation Statement
The core statement is: "my sister's mother-in-law's only son is Devika's father."
Let's decode this part by part:
- My sister's mother-in-law: A person's mother-in-law is the mother of their spouse. So, this is the mother of my sister's husband.
- My sister's mother-in-law's only son: The mother of my sister's husband has only one son. Since she is the mother of my sister's husband, her only son must be my sister's husband.
So, we have deduced that "my sister's mother-in-law's only son" is actually my sister's husband.
Now, the statement continues: "... is Devika's father."
Combining our deduction: My sister's husband is Devika's father.
This means Devika is the daughter of my sister and my sister's husband.
Determining Devika's Paternal Grandfather's Relation
We need to find out how Devika's paternal grandfather is related to my sister.
- Devika's father: As established, Devika's father is my sister's husband.
- Devika's paternal grandfather: A paternal grandfather is the father of one's father. So, Devika's paternal grandfather is the father of Devika's father.
Since Devika's father is my sister's husband, Devika's paternal grandfather is the father of my sister's husband.
The father of a person's husband is that person's father-in-law.
Therefore, Devika's paternal grandfather is my sister's father-in-law.
Summary of Relations
| Relation | Implies |
|---|---|
| My sister's mother-in-law | Mother of my sister's husband |
| My sister's mother-in-law's only son | My sister's husband |
| This person is Devika's father | My sister's husband is Devika's father |
| Devika's paternal grandfather | Father of Devika's father |
| Devika's paternal grandfather (substituted) | Father of my sister's husband |
| Father of my sister's husband | My sister's father-in-law |
Based on the analysis, Devika's paternal grandfather is the father of my sister's husband, which means he is my sister's father-in-law.
Revision Table: Key Blood Relations
| Relation | Description |
|---|---|
| Mother-in-law | Mother of spouse |
| Father-in-law | Father of spouse |
| Paternal Grandfather | Father of one's father |
Additional Information: Solving Blood Relation Puzzles
Blood relation questions often involve decoding a series of relationships. A good strategy is to break down the statement into smaller parts and identify the direct relationship between individuals mentioned. Start from the 'from' end of the relationship (e.g., "my sister's...") and move towards the 'to' end ("...only son"). Visual diagrams can also be helpful, though not strictly necessary for simpler problems like this one. Practice is key to mastering blood relation problems for competitive exams.
Important Questions from General Blood Relation Problems
Pointing to a girl in a college poster, Deepika said, "She is my mother-in-law's only son’s niece". How is that girl's mother related to Deepika?
Pointing to the photograph of a girl, Raghav said, "She is my father's mother's daughter's only brother's daughter". How is Raghav's father related to that girl's mother?
Pointing towards a woman, Reena said, “She is the only daughter of my father-in-law.” How is the woman related to Reena?
Pointing towards Sumit, Anuj said, “He is my mother’s father’s son’s brother’s son”. If Vinita who is married to Kartik, is the mother of Anuj, then how is Vinita related to Sumit?
Introducing Reshma to a guest, a lady, Karishma, said, “She is the daughter of my father-in-law’s daughter”. How is Reshma related to Karishma?
