My SD decided to tell me that only her 9 y/o wasn't allowed to be anywhere alone with her 19y/o brother. Mind you she has another daughter. I simply told her I no longer was comfortable with keeping the kids over night if she wasn't present. My thoughts are to protect my son. Nothing has happened I respect kids not being left alone and you should know who they are around. I also don't want something innocent to be turned into something else.