Why wouldn't your nephew just ignore the footsteps and go back to sleep. And why would he be nervous about footsteps? Did somebody tell him he was going to hear a ghost that night?It was a very active home. We all had experiences day or night over those years. But most were at night, usually between 10pm - midnight. I don't believe anyone ever had any experiences late-late at night however.
We talked about calling someone, but always felt whoever it was would be some crackpot weirdo, so no we never did.
My nephew, was a staunch non believer until he stayed a weekend downstairs over a visit.
Freaked him out. He heard the footsteps that evening and was nervous enough to wake me up. He said he got up and walked to the doorway, still hearing the footsteps coming right toward him but obviously no one was there. The dude was white, I just kept saying I told you so. He was well into his 20s then, and slept in my son's room that night.
He still occasionally brings that up to this day.