Sorry for your loss and your pain. I have not lost a parent but I have lost enough friends and a lover to understand the grief and that some pain pockets have infinite depth and thus never empty. Yet, as they drain they also create an infinite amount of space for light to replace the darkness.
I wrote this tanka about grieving last year:
Deaths’ facts differ still
Will drives lives’ paths to deaths’ dates
Love burns — searing pain
Deepest loss most room for gain
Endless pain, Light fills the drain
If you want to read my thoughts behind the poem, the story contains them: https://medium.com/illumination-curated/the-illusion-of-death-84c4c250df80