I have an incredibly devout younger DB. He is religious to the point that his children don't go to school, they live in London but don't speak a word of English and they aren't allowed to know about the existance their non-religious family members.
My DM wants to see her DGC and is planning on making a visit this coming weekend. She hasn't been allowed to see them in about two years. However, my DB has told her that the only way she is allowed to come is if she doesn't tell her grandchildren that she is their grandmother because she is not religious enough and they don't want them to have any outside influences. She has to pretend that she's an "old family friend".
I am really angry that my DM is going to have to pretend to be a stranger to her own DGC. It got me thinking - the children are all under 5 and only speak what is essentially a dead language, they aren't allowed to go to school and aren't aware of the existence of their family. How is that different to a cult?