God's Will is to go through whatever you are going through with Y O U! It is not for me or anyone else to tell you how God is going to demonstrate His power in the lives of your relatives,so all we can do is pray,as you suggested.Please remember our family your prayrs.
My brother's son,Michael Paul is dying as I type.
He is only 43 yrs old.
My brother lost his wife and their chidren lost their mother this time last year.
Also,remember his mother's family.
I feel so sad for my brother.I know what it is to lose a child.
Thank you and God bless.
Nevertheless,I can agree with you in JESUS' Holy and Matchless Name,that He will enter the lives of your relatives,and cause them to seek God's answer for them at this time.May the LORD give them the gift of faith to stand with Him as He desires to be with your relatives in this time of suffering.Whether your nephew will be healed or sent to his final reward,it is in God's hands,may the LORD grant your nephew the faith to be saved and be released,or have the faith to believe in his healing.Only God knows how that will happen.
The LORD richly bless you fol,as you pray on this end.