No, there is no law that would give a care provider more money than what the ones who didn't care for the person. If a loved one passes, they would have had to make it known in their will that they wanted you to get more money. Hopefully, the person was cared for out of love and not based on how much much they would receive.
We help our loved ones because they are our loved ones. Not as an investment. It would not be unreasonable however to request reimbursement from the estate for major expenses that were not covered by the deceased. Don't expect to recoupe any of your contributions however. Sorry for your loss.