5 month old loses daddy at 26

My daughter lost the love of her life and my grandson lost his, "HERO", his daddy suddenly passed away on July 17,2017. While playing basketball with a church league when he suddenly passed out and was unable to be revived. This was a man who was physically fit in every way. He made sure he worked out and ate right. My daughter is struggling with understanding how this happens to a man that is just 26. She is lost in so many ways. Most of all how she will raise their son in every way he wanted. His father passed away at 26, before he was born, and all he ever wanted was to be the daddy that his father didn't get to be to him. He was so happy to be sharing  the joy of bringing a child into this world with the person he loved most. He was named after his father and was so thrilled when they found out they were having a boy, a son to carry on not only his name, but his fathers as well. He called him the "Chosen One" from Day 1 after finding out he was having a son.  Now I am asking for any help that you are able to give to his mommy to help provide him with the things needed to raise this sweet boy. 
Thank You So Very Much!!!