Sorry to hear this...I lost my father to Brain Cancer...he was 57. It is a horrific thing to go through.
I lost my mother to a glioblastoma multiforme. It is a disease that is hell on earth.
I am very sorry for your loss. Cancer is so cruel. My youngest uncle died 2 years ago, at the age of 54 from gall bladder cancer that spread to the liver before anything was detected. He was stage 3 1/2 when it was found. It was the most horrible slow death. Your father was also very young. Cancer took my vital young uncle and killed him in about a year. It was devastating how he suffered. I share in your grief of losing someone dear to cancer.