$M$ has a son $Q$ and a daughter  $R.$ He has no other children. $E$ is the mother of $P$ and daughter-in-law of $M.$ How is $P$ related to $M?$

1. $P$ is the son-in-law of $M$
2. $P$ is the grandchild of $M$
3. $P$ is the daughter-in-law of $M$
4. $P$ is the grandfather of $M$

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