
I bought a house that is nearly 2000 years old; it was built in 1826. And yes, it was definitely haunted, a fact I was awakened to at 3 in the morning my first, second, and third nites there. I called all my Christian friends at the time over, and we took anointing oil and anointed all the doors and windows and went thru the house praying in the Spirit, commanding out anything that was not like God to leave. The next nite, I was rudely awakened again, and asked God, why didn't this leave? Believe this or not, He said it came in thru the water pipes/well.
So I anointed them and prayed over them, and went back thru the house with friends again the next morning, just for good measure. When I told one of them what He had told me she said, "Well, sis, God told me to tell you that the first time we were here and I did, remember?"
Well, I didn't hear it evidently, but 2 others heard her say it. MY mistake, LOL....so when we did it the second time, I kid you not, it shook the windows in the last room we went to, as it left the building. Never had a problem since and that was 16 years ago.
Another interesting aside; one of the visitations was an apparition of a man in a long coat and 40's style hat, who walked thru my bedroom and into my closet whereupon I heard stairsteps. A few months later I was talking to my neighbor who was in his 70 's then and the house was his family home place; he grew up there. He casually mentioned, "Well, you know the stairs in that house are not original don't you? The stairs originally came up into your bedroom where your closet is now." I about fell over, but held it together, lest he think his new neighbor is a .....ahem......closet case, LOL........
All joking aside, it is a serious matter. I believe there is a difference between demonic spirits and ghosts, but neither are pleasant roommates. I would make sure that your fiance and her little sister have not knowingly (or thru innocently not understanding) participated in any form of witchcraft such as fortune telling, astrology, ouija boards, Dungeons and Dragons, ect., and if so repent of such activities.
In the 2 years the Lord had me walk in deliverance, I rarely ministered to any in that situation (with the exception of those that just moved into a new house and it was residual from what the previous owners did), that did not unknowingly open the door to it, thru things that they thought were "harmless" and "just games". They are not just games, and they are definitely not harmless. Has it occurred to you that the Lord may be allowing this situation to underscore the fact that, they too, need Him to be Lord of their life? Blessings to you all, will be praying for His perfect will to be done.....