Keep contact — without confrontation, without humiliation
The first instinct — direct confrontation (“you're in a cult”) — is almost always counterproductive. Coercion strengthens the moment a person feels judged or attacked. The group then exploits it: “see, we told you, they don't understand you”.
Instead: maintain regular, neutral, unconditional contact. A short message, a quick call, presence at key moments (birthdays, holidays, family emergencies). You signal that the door remains open.