Hi Decky.
I felt led to respond to your post as I can identify with your loss. Four years ago my father died, very sudden aged only 69. He too had young grand children. Two years ago just passed my youngest brother was mowed down and killed by a drink driver aged only 37. He had a 6 yr old son and a wife. As I'm typing my mother has maybe weeks to live, she's dying of skin cancer, in constant pain, her lungs keep filling with fluid causing great difficulty in breathing etc. She's 62.
Although you may not see it now, and I know how hard it is to reconcile this in ones mind when suffering loss, but God is hearing your prayers and answering every single one of them.
Remember, God works all things after the council of His own will, including how He chooses to answer our prayers. The answers we get we don't always see, and often its not the answer we want, but its the answer God wills and its the answer we need to conform us to the image of His son.
1 Peter 1:7 That the trial of your faith, being much more precious than of gold that perisheth, though it be tried with fire, might be found unto praise and honour and glory at the appearing of Jesus Christ:
1 Peter 4:12 Beloved, think it not strange concerning the fiery trial which is to try you, as though some strange thing happened unto you: 13But rejoice, inasmuch as ye are partakers of Christ's sufferings; that, when his glory shall be revealed, ye may be glad also with exceeding joy.