Cole references Bible teacher Nancy Guthrie's work with parents in grief. Here is her excellent workshop from the Rooted 2018 conference: Nancy Guthrie on What Grieving People Wish You Knew about What Really Helps and What Really Hurts
Additionally, Cameron Cole has written a book about God's faithfulness in the loss of his son: Therefore I Have Hope: 12 Truths That Comfort, Sustain, and Redeem in Tragedy.
Please see also these resources on Rooted:
Helping Our Kids Through Grief and Disappointment Caused by COVID-19 by Kristen Hatton
ASK Rooted: How Do You Minister to a Student Whose Loved One Is Sick Or Has Died?
Don't Hurry the Hurt by Kristen Hatton
The Lost Season: Helping Student Athletes Thrive During COVID by Arek O'Connell
Rooted Podcast: Helping Kids Deal With Grief