Just found out my neighbor(duplex) is a offender. What do I do?

So my landlord never told me. I just happened to be looking on the offender list and say my address and saw the neighbors 30 year old son. At the time of the crime he was 24 and she was 6. 6 is not a typo. I have a 9 year old daughter I have every other weekend. I live in Illinois. Isn't my landlord supposed to tell me this information? What should I do? It took me forever to find this place! I've only been here three weeks.