Our dear 13Y boy is on his last days. He's having several seizures everyday (it started very suddenly and keeps increasing) caused by a tumor or a bloodclot on the brain. 
DH took him to the vets today and they basically said it's a matter of days/weeks or we can give him a peaceful death when we are ready.
I'm beside myself with sadness and how will I explain it to our girls. They grew up with the cat and love him dearly. I would appreciate any tips on how to deal with it as a family and help the girls cope with his imminent departure.
TIA