I can understand that this is a frustrating situation for you and your mother. What you really need to do is speak with an attorney immediately regarding legal options before you start videotaping everything. You can locate one through the attorney locator on Lawinfo's home page at
http://www.lawinfo.com/. Some do offer free consultations. He or she will best be able to tell you if you can videotape anything and if it even can be used.