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Option 3 : O
According to the given information,
1) M is elder than P;
M > P
2) N is younger than P but elder than O;
P > N > O
3) R is elder than P;
R > P
4) S is younger than only one member but elder than R, thus;
On combining the all statements:
M > S > R > P > N > O
Hence, O is the youngest in the family.
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