Top Secret (Week 14)

I arrive at my locker, to find a letter with step by step instructions of a mission I am responsible of accomplishing. The FBI is in the process of a murder investigation, and I could be a very useful asset. They need an unknown face to go undercover as a 4th grader, and become close friends with one of the students. This would be a solo act, to where I get this person (who shall not be named) to invite me into their home. Their mother is a suspect of a mass murder crime committed 6 short months ago. The dad is a suspected accomplice, and they have reason to believe the 4th grader may be a part of it as well. So it is my sworn duty to find whatever information I can on these people.