M and N have four children P,Q,R,S. Only P and R are married, and they have children X and Y respectively. If Y is a legitimate child of W, which statement is necessarily false under the family relationships intended?
Y is the child of R, and W is Y’s other parent, so W is R’s spouse in the ordinary family-tree assumptions of the question. W therefore cannot instead be P’s wife. Select D. The genders of M and R are not specified, so A,B,C can be consistent for suitable assignments.
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