Is my grandmas house haunted?

Whenever im in a room alone i have this SUPER creepy feeling someone is watching me, and i dont get that anywhere else. At night i always hear things moving around and my grandma says its probably just mice (she lives in the country) but i dont think mice could make these noises. One time everyone was in the family room (on one side of the house) and i was cooking in the kitchen, (in the middle) and on the other side are the bedrooms, and i kept hearing doors open and shut and footsteps and i thought my sister was home and just got up but it turned out she wasnt home and nobody was in there. Cold drafts are also common. Is her house haunted?