Zookeeper and you others that are going through such challenges in life, its not fair, difficult at best. I wish there was something more we could do. I have lost several friends over the past few years to cancer and its just not right taking middle aged folks, its way to soon.
Do not give up hope with treatment on your mom, but also from my own experience with my gram with brain cancer, she chose to go for reduction, nerve snipping and living what she had left in peace. The guilt took its toll on my mom, an only child, feeling she did not do all she should have done, but this is now your moms choice. I sound mean saying this (I do not mean she is not going to live), but she is the one that needs the strength to fight, do all you can to see her as the queen on her throne! Reminding her how much you love her and spend this time learning how to laugh in front of her, crying at home. Don't forget to include your kids in the process or they may feel guilt thinking they did wrong.
I recall my gram passed here at home it was on Easter (not saying anything about your family) but as a 10 yr old, we never celebrated Easter again. As a kid, it seemed unfair and what did I do so bad? As the adult, I'd be beside my mom 100%. So when you took your children out, kudos to you, you don't know how much you changed that outcome for your kids. Also, seeing you cry is not a bad thing, as long as they realize why so they don't feel guilty, we know how kids can be, they seem to take on the blame for it all.
I realize you understand all this, but you are doing so well with this, a lot of people clam up and hide it. If you don't say it, it won't happen, hang in there and perhaps if we flood her with good positive thoughts, and you too, we can lighten your loads.
God bless your mom, you and your family. You will continue in our prayers. Take time out for you. ~Kel