If you use Smart Limits to block numbers on a family member’s line:

In the modern age, the "Block" feature is our primary defense mechanism. It is the moat we draw up around our peace of mind. When we block someone, we are engaging in a radical act of self-preservation. We are saying, “Your access to me is a privilege I have revoked. Your voice is a noise I no longer wish to translate.” The block creates a sterile silence where chaos used to be. It grants us the space to heal without the constant reopening of the wound.