how do you get someone to stop seeing your facebook statuses?

[tayy.]

well these people keep getting on my facebook and harrassing my mother about what i say and what she says when anything we say isnt their business.. its my brothers father and wife. they are trying to take my brother and mad that they are losing, so they try to dig dirt on us and they arent even on my friends and i have changed all my privacy settings so idk how they are still seeing our statuses.. how do i make it stop?????