You need to be asking the insurance company what their rules about this are. Sometimes the rules of the insurance company are outside of state law.
With a matter of this importance, you really need to be consulting with a local attorney since there is probably NOT an Indiana probate attorney reading this message board.
Some states allow decedents estate to have assets put in and other states do not.
If the money does go into the wife's estate, then, yes by law her next of kin will inherit IF SHE LEFT NO WILL (you didn't mention whether either party left a will), first to her children, and then to her brothers and sisters if there are no children.