You are right that the only person who has a legal claim for a wrongful death suit is Caylee's father, or if he is deceased, his estate. The lady in Boston is suing Casey on behalf of her sons estate, which is legal. The fact is that someone fathered that little girl. As usual Casey will never admit the truth as far as who it is, but the thing about these wrongful death suits is that a judge will order a paternity test to be done, Casey has no choice in the matter. And yes, Casey is currently penniless, but if someone wins a lawsuit against her, they will be entitled to her future earnings until the money is paid off. A good example of this was when Fred Goldman won the lawsuit against OJ. From then on, all the money OJ made had to be given to the Goldmans.