Well as soon as she got the new one in the house it started going off.
So they called the fire dept and went to the neighbors (she lives in a house that was made into a duplex.) Said they wouldnt answer. The fire dept came and they beat on their doors and windows but arent sure if anybody is home.
The fire dept told her that they had to wait on the cops before they could make entry into the neighbors house.
The cops and medics are on the way now... I'll keep you guys posted....
Right now Im just thankful they had a carbon monoxide detector and my niece and my sister and her fiancee are out alive...
I really hope the neighbors are not at home, otherwise I fear the worse for them.