Seven people of a family P1, P2, P3, P4, P5, P6 & P7 go on a picnic in a sports utility vehicle. P4 is the sister of P7, P2 is the mother of P6's wife. P6 is the son-in-law of P3. P5 and P7 are the grandsons of P3. Two people in that group of 7 are fathers; two are brothers; and two are mothers; and one is a sister. What is the relationship between P1 and P4?
By tracing the family tree: 1. P6 is the son-in-law of P3. 2. P2 is the mother of P6's wife. This means P3 and P2 are a married couple, where P2 is the mother and P3 is the father. 3. P1 must be the wife of P6 (since she is the remaining female to fulfill the "two mothers" requirement along with P2). 4. P5 and P7 are grandsons of P3. P4 is the sister of P7. Thus, P4, P5, and P7 are the children of P6 and P1. Therefore, P1 is the mother and P4 is her daughter. The relationship is Mother - Daughter.
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