This is Odd

I've posted a question about Voice2Go on here with no answers yet. I have another issue that I discovered over the weekend. When someone calls my cell phone (not Xfinity Mobile), my cell phone rings, but so does my home phone. My home phone will ring with my cell phone's ringtone. I don't have call forwarding engaged on either my cell phone or my home phone (as described in my previous posts). This is the weirdest thing I have seen. So, basically, when I'm at work and someone calls my cell phone, my wife can actually pick up our home phone and answer my cell call. Not that I have anything to hide, but I'd rather it not happen that way. Any suggestions?