Timmy
Out of the entire group, Tim Murphy seemed to get the most abuse. Don't get me wrong, Dennis Nedry suffered during his death (in the book, he got it way worse), and Gennaro got eaten alive. Tim, however, got beat up far more than any other character.
Dr. Alan Grant got off easy with cuts and brusies; Dr. Ellie Sattler pretty much got the sh!t scared out of her by a raptor and was draggin a goddamn flashlight behind her, twisting her ankle; Lex was in the same vehicle as Tim that was crushed by the T-Rex, but Grant rescued her before more damage could be done. She did get sneezed on. Ian Malcolm was the only other person who got busted up with two broken legs.
Tim was in a vehicle that was flipped over by a T-Rex, then the vehicle was crushed, trapping Timmy's legs in the seat. The Explorer was then tipped over the ravine and landed in a tree, with Timmy still trapped in the vehicle. Then the kid was inadvertently electrocuted when the power was turned back on. The 10,000 volts surging through his body stopped his heart for a few minutes. Finally, Timmy barely avoided being eviscerated by a pursing raptor when both he and the raptor slipped on the ice. In a way, Lex rescued her little brother by slamming the freezer door on the raptor when it came to its senses after slamming into shelving.
In my opinion, I would say that Tim had it bad compared to not only the other kids in the series, but also in comparison to some of the adults in the franchise. Tim took a hell of a lot of abuse.
Knock it off, Hudson.