Answer:
.
S = {(M, F, S), (M, S, F), (F, S, M), (F, M) S), (S, F, M), (S, M, F)}
where M = mother,
F = father and S = son n(S) = 6
E = {M, F, S), (F,
M, S), (S, F, M), (S, M, F)}
F = {(M, F, S),
(S, F, M)}
Also
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