To help me try to answer this question, are you asking whether there is any legal basis (other than Fla. Stat Sec. 732.802 entitled "Killer not entitled to receive property or other benefits by reason of victim's death") under which an heir could be denied the right to inherit?
You can petition the court to be appointed guardian over your younger siblings. There is a specific process, and the proposed guardian has to submit an application. The matter of who should be appointed guardian could get sticky, since the judge will have to make his/her decision in the best interests of the minor children, and it may be hard for the judge to determine what will be best for the minors. You may have to prove that you are responsible enough to take care of them. When you...
This type of situation occurs sometimes: If an elderly person did not adequately communicate to family members certain essential information, then it may be hard to find it out. Very often I am asking family members if their loved one maintained a safe-deposit box, and they don't know. Sometimes they don't even know if a Last Will exists. If you are asking if there is a registry of attorneys and whom they represent, no. But the county court where your aunt lived can tell you if there has...