Presence felt

My husband's not one to believe in anything he can't really see but he felt like someone was behind him and someone touch his shoulder while giving our son a bath. When i was in there I felt someone walk up behind me and 100% expected to see my husband but no one was there. And there's been a few times my son has looked into the doorway behind me like he was looking at someone but no one was there. Idk what to do is creeping us out.