Meditation is a research-based method for decreasing stress and depression. I think it can also help folks with their grief.

I hope these guided meditations will bring you some solace while you think of your father.

Coping with Grief: Guided Spoken Meditation for healing after a loss of a loved one
YouTube

Guided Meditation on Grief for Loss of a Loved One
YouTube

10 Minute Guided Imagery Meditation | City of Hope
YouTube