This might sound silly, but I wanted to find a "Halloween-y" hymn. I think the first two verses of I'm a Pilgrim, I'm a Stranger are actually pretty spooky (if you're in that mind set). It's actually a beautiful hymn for non-Halloween times as well. I changed "Father" to "Parents" and also added "Mother" to the third verse.
I’m a pilgrim, I’m a stranger
Cast upon the rocky shore
Of a land where deathly danger
Surges with a sullen roar,
Oft despairing, oft despairing,
Lest I reach my home no more.
Misty vapors rise before me.
Scarcely can I see the way.
Clouds of darkest hue hang o’er me,
And I’m apt to go astray
With the many, with the many
That are now the vulture’s prey.
O my Parents, I entreat thee,
Let me see thy beck’ning hands;
And when straying, may I meet thee
Ere I join the silent band.
Guide me, Mother, guide me, Father,
Safely to the promised land.