Her husband and his crew stole $2,000,000 and supposedly he killed all his crew and kept the loot for himself. All his crew had these skull rings. When she started digging in the desert it looks as if she was digging at the burial site where her husband buried his crew. I also think that the grandmother (husband's mom) and maybe the kid know were the husband is hiding out. Also it looks as the husband will take the kid and hide out on some Carribean island when he has the chance. Looks as if Grandma is in on the plan.