In this case, you need to investigate/trace your roots - your grand parents, great grandparents, etc.
If any of your grandparents or great grandparents were involved in occult activities, your parents or yourself may "inherit" these spirits which they had contacted/involved with. These spirits will continue to harass and disturb your family.
You will need to terminate, renounce and cut off any tie with them.
Then you will need to cast them out and command them to leave you and your family by the power of God.