Latte’s surgery

This past week our cat has been very sick, we didn’t know what was going on so of course we took him to the vet to find out he ate some sort of toy that’s affecting his stomach. Today they advised my sister that he needs surgery otherwise we need to make the decision to put him down.
My oldest niece is allergic to all dogs and cats but not this one, for some reason, she’s been so happy ever since we got her this cat because she always wanted pets but ended up being allergic even when they were hypoallergenic so when she was finally able to have a cat she was so happy!! All three if my nieces love Latte and we all do! He is a sweet little baby because yes he is still a baby!!! So I am asking everyone and anyone to PLEASE help us so we don’t have to tell our little girls that their bestfriend has to go, specially right around Christmas.
I understand not everyone is an animal person but we love Latte and he is family, so anything you can do to help we would greatly appreciate it!!