Agh. I will assume this is a case of someone unwittingly opening the front door into spiritual main street and getting unwanted visits as a result. Which happens frequently, really. Negative entities saw the door and now they hang around. There are to ways to deal with it, in my experience. A cleansing can get the negs on the run for the moment. A longer term solution is to get your nieces' spirit guides to get on the gate keeping job or ask them to enlist stronger guides for that task.
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Better to light a candle than to curse the darkness.
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