Children are incredibly resilient with respect to pets, IMHO. Family, friends, neighbors, or even strangers dying before them is a very different thing. This comes from personal experience with both events.
I rescued a cat years ago as a kitten, tamed it. My son fell in love with it. A family who lived out in the mountains wanted some mousing cats, so I gave them the cat since we had others. My son, to this day, has never forgiven me.
part of childhood is having your goldfish, your cat, your bunny rabbit, your dog, your gerbil die.
My solution, because no way should an animal be evacuated during something like this, is to do what I did when one of our kittens die.
Go out and find a damned double of snowball and tell the kid snowball is home and that if he seems different it is because he is upset.
Animals don't belong in refugee centers and on emergency helicopters or in busses.
It is awful, but this whole thing is triage and making hard hard decisions fast.