His wife's death reminded him of his own mortality. (他太太的過世讓他想起了他自己的死亡。)

Her husband's death reminded her of her own mortality. (她先生的過世讓她想起了她自己的死亡。)

His wife's death reminded him of his own mortality. (他太太的過世讓他想起了他自己的死亡。)