Steve, so sorry to hear of your loss. It isn't easy for anyone. I hope your wife is handling it well. She hurts for herself, her mom and her father. It can stack up so take extra care of her.
58 years, that is a long time. I don't know what I would do if I lost my spouse and we have only been alive for 56 years. That woman just lost a huge amount of her world.
Sending good thoughts and prayers your way. Also praying for healing for the whole family. Ours became closer when my Step Father died. I hope this turns out to be as good as it can be for your family.