Please just read and give me your opinions?

Today my mom told me my pap has cancer she says they've known for a long time now and he will be fine once he gets the surgery. The thing is if they've known for a long time why couldn't she have waited 2 more days until after Christmas. This year is my daughters first Christmas and I wanted so bad to just be happy and my mom knew this. I have been going through emotional issues and I am the type of person to stew in my own misery. I have ocd and have been a hypochondriac since I was ten being most scared of cancer. I feel like sometimes if you love someone and want to protect them if its not the right time to tell someone something you shouldn't. What do you think? Was it really necessary 2 days before Christmas?