I have become the temporary legal guardian of two children and I need advice

All,This is a throw away account created but I assure you all this is not a throw away story. I hope these are the correct sub-reddits. I will try to be as brief as possible but the story behind why I am asking for advice is serious. I am a married man and between me and my wife we have four children. One of our daughters who is ten had a friend come over for a sleepover. She is someone we have known for over a year. Her biological mother is out of the picture and she has been raised by her father and her step-mother for a very long time. The night that she stayed over she confided to our daughter, in her own terminology, that she was being sexually abused by her father and has been for a very long time. Our daughter and her friend were upset and crying. My wife heard this, checked on them, and this girl told my wife. This must have been around midnight and we immediately called our local Department of Children and Families (DCF). Investigators came to our home to get statements from us and they questioned the girl. The girl tells the investigators more than what we heard early in the morning which is understandable given their official capacity. All I will say about that is whatever horror you can imagine when it comes to sexual abuse against children it is that bad. She has an older sister that is 13. She was at a relatives house with the step-mother while the father was at work. The investigators question her at the relative's home and she corroborates the sister's story. The step-mother did not know.The investigators went to the father's work to question him with a police officer. Keep in mind that this point an investigation has to happen before an arrest can be made. The father says he is not going to make any statements until he speaks to a lawyer. He leaves work, goes home, and commits suicide. Since we know these children we decided to become their legal temporary guardian until this mess sorts out. DCF has to investigate the step-mother and any other family that wants to take care of these children before they will hand them over.Under the advice of the officials handling this case we have been told not to say anything about their father's demise. They feel it's best they hear it from family with a counselor present. It's been nearly a week and they're likely going to find out today or tomorrow. They are also likely going to be coming to our home after they hear this tragic news. How do we handle this? How do we help them and support them? I care about the safety and welfare of these children but I don't know them like I know my own children.Please help! via /r/Parenting http://ift.tt/2a6PBOh