Ultimately, you will need to check with the at-fault party's insurance company to see how they are going to handle your claim. (Also, you may want to seek some legal help with your claim.) But, in general, there is no percentage of property damage that is divided amongst the claimants. Also, in general, the auto insurance company of the at-fault party most likely will not contribute towards the remaining 20% of medical expenses incurred by the passenger of your vehicle.