You guys, Take Jhies' advice and it works. Its not because you cannot see them that they can't hear you, they see you and they can hear you and it won't hurt to Ask, Always ask permission.
Corel, Exorcism and Spirit Possession (nalubbunan or sinakyan or sinapian) happens all the time and the person that had the experience of being possessed will not remember what transpired and he or she will feel tired, like he or she carried a heavy burden. I suggest you acquire some Holy water from your Parish and maybe ask the Priest for Exorcism prayer that you yourself can use. For a person to witness such occurrence is sometimes scary but one gets over it but it is more scary for the victim possessed. Get a rosary, have it blessed by a Priest and let the victim wear it at all times, maybe take it off only when taking a bath. GOOGLE, enter Exorcism Prayers and Take the one for Catholics and print it. It works !