My sister's home has been having strange activity happening from lights going on and off and now a black shadow figure has appeared which is very tall. And her vase has also moved. She is very worried about why this has started happening.a chair has also been moved while in her sight with no explanation. Please all answers greatly appreciated.

You mentioned other members of the family have experiences as well? Who all has seen what? There can be a number of reasons this has "started" in her home. How long has she lived there before stuff started happening and does she know any of the history of the home? Have there been any sort of religious practices or the occult in the home? Are there children involved in the home?