What would you have done?
The ungrateful kids have not even gotten in touch with the foolish good samaritan to thank him. The dead guy knew how his kids were and he was hiding the money from them. No karma involved in keeping the moolah IMO. heck, the dead guy is prolly trying to bust out of his coffin so he could scream NO - not to THEM!
The money will be squandered in 6 months, if it gets followed which it won't.