If $H+I$ means $H$ is the sister of $I$; $H-I$ means $H$ is the brother of $I$ and $H\times I$ means $H$ is the mother of $I$, which of the following means $J$ is the daughter of $P$?

Let's decode each option to check where $J$ is the daughter of $P$:
* Option A: $P-Q\times J-M$
* $P-Q⟹P$ is the brother of $Q$.
* $Q\times J⟹Q$ is the mother of $J$.
* $J-M⟹J$ is the brother of $M$ (so $J$ is male).
* Thus, $J$ is the nephew of $P$. This is incorrect.

* Option B: $P+Q-J\times M$
* $P$ is the sister of $Q$, $Q$ is the brother of $J$, and $J$ is the mother of $M$.
* Here, $P$ and $J$ are siblings. This is incorrect.

* Option C: $P-Q\times J+M$
* $P$ is the brother of $Q$, $Q$ is the mother of $J$, and $J$ is the sister of $M$.
* Here, $J$ is the niece of $P$. This is incorrect.

* Option D: $P\times Q-J+M$
* $P\times Q⟹P$ is the mother of $Q$.
* $Q-J⟹Q$ is the brother of $J$ (meaning $Q$ and $J$ are siblings).
* $J+M⟹J$ is the sister of $M$ (meaning $J$ is female).
* Since $P$ is the mother of $Q$, and $Q$ and $J$ are siblings, $P$ is the mother of $J$. Since $J$ is female, $J$ is the daughter of $P$.

Hence, Option D is correct.