Need help with spirits

I have to admit I've been out of practice for a long time. I've always been able to see and feel spirits, my son seems to be the same. We do have a few spirits in our home. Recently my son has started speaking of the Hat Man. He does have a sleeping disorder, but he sees him during the day.

I'm worried that banishing any bad spirits might accidentally banish some good spirits. Is there any way to ward against this?