MY UNCLES MIRROR

There is this mirror in my uncle's house no body dears to look at, it always hanged up at the reach and view of no one.
Because of this weird law, I and my siblings don't go to our uncle's house. He was very wealthy and that got us more scared, not until our parents died.
We were forced to go live with our uncle, since he was our only surviving relative. Again my uncle reviewed the rules with us.
I was the type who goes out at night to get water to drink. One night while I was entering the kitchen when I cut sight of my uncle viewing the mirror.