HELP!! PLEASEEE IS REALLY URGENT!!?

Happens to be that there was/is a squirrel Anoying my step father, so he putted tramps,(live tramps he said) To get'em (i did not like this decision tough) afetr many days, he caugh a squirrel today, and when i woke up he told me, then i went to see it, and it w almost dead with an injury close to his nose, i putted him in a hamster cage with water and peanuts, he won't move a lot, i can't let this poor animal die in front of me! he said that an hour ago he was like crazy, now is almost dead, i dont know how to cure, idont wanna let it die!! Im desperate PLEASE HELP ME, with whatever you think i can do, no matter if is not especialy for squirrels. (i don't have any money for bring it to any et, and my parents wouldn't let me.)