Families With Haunted Houses

I think some of my family members may have a haunted house.

First is my grandma. I was in the living room watching TV with my younger cousin. My grandma went into the kitchen. I didn't notice her walk out, but my cousin did. We thought we saw something move around in the kitchen. I thought it was my grandma, but my cousin didn't. So we both checked it out. No one was there.

Next is my older cousin's house. It has a guest room. My sister and I had to sleep in it. For some odd reason it was like, REALLY cold. No matter how much we snuggled under the blanket. The heater was on as well. We also have a feeling that there's someone watching us.

Anyone have an explanation?