What Do I Do? This Man May Be A Sex Offender ! Help?

Call Child Protective Services - if you are worried about the reciprocation's coming back at you, make the call anonymously. Call the Sheriffs department and inform them. Children will not lie about this sort of activity - you need to believe them and take action. Trust your instincts on this - if your instincts are right you and your nieces will thank you later for this, where as not acting you will live with the guilt for the rest of your life and your nieces completely ruined for the rest of their life.