I could use some opinions or insight please! My son is my only child. He is about to be 14 months old. My nephew is about to turn 5 on Christmas Day. This is the second time in a row that my nephew has been mean to my son!!! Last time he smashed a pillow in Gianni's face, said "I'm going to kill him dead" and when I removed Gianni he threw pillows at him from across the room. He took a toy my son was playing with and stomped it, obviously breaking it. He turned on a (it was plastic) fan that was missing the front screen. He put Gianni's hand inside, one of Gianni's fingers got cut. He does all of this very sneaky. Like when I was digging in my diaper bag or getting his brother to stop jumping on the couch. I thought it was because I was the only adult and it was 3 kids. Testing his boundaries. My mom says I'm paranoid and making this up.
Today my nephew again threw things at my son! He then put his face in my son's and made this horribly mean face started saying scary angry things. While almost head butting him. I told him to stop and obviously grabbed my son. So it didn't happen for long. But then Gianni was just walking past and my nephew spanked him! Multiple times. I told him "no we do not spank the baby!!!" I don't believe in spanking my son and especially not at only a year old! My nephew then jumped on the bed my son was playing by and went to kick him in the head.

We are now hiding in a different room. Idk what to say or do. My brother and mother all acted like I was the issue. They call my son bad! I don't understand. And I obviously don't want my son to ever get hurt. We hardly get to see my family. I really wanted things to be nice.