Avi K
That was a simple one, I know of even a worse one, I know of a BT whose brother was getting married to a Non-Jew. her mother told her to attend the wedding (And be a part of the Wedding party) or else she would be cut off (This person needed her mothers help alot financially so this was not an idle threat, it was serious), Her mother never really liked her religious choices or the husband she married, so it was not something she could easily dismiss especially since she really needed the financial help