I don't have words that can express how much I feel for you and your family. My dad (48) passed away this past Monday unexpectedly. I'm 7 months pregnant and have realized that my daughter will never be able to meet her grandfather.
Being a daughter who lost one of the most important men in her life, I can promise you that God, family, and friends will take care of those who need it most. I'll admit that it will be most difficult for your wife, kids, and parents...but it's amazing how God protects and soothes you when you feel like it's unbearable.
I will definitely keep you all in my thoughts and prayers. If you think that your family may need additional support, please PM me and I'll see what I can do. It's amazing how much it helps to talk to people who have gone through a similar experience.
God bless.