+1 vote

Each of $P, Q, R, S, W, X, Y$and $Z$ has been married at most once . $X$ and $Y$ are married and have two children $P$ and $Q. Z$ is the grandfather of the daughter $S$ of $P$. Further , $Z$ and $Z$ are married and are parents of $R$. Which one of the following must necessarily be FALSE?

1. $X$ is the mother-in-law of $R$
2. $P$ and $R$ are not married to each other
3. $P$ is a son of $X$ and $Y$
4. $Q$ cannot be married to $R$

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