My partner has two children by his ex partner, they separated a long time ago and she had made it very difficult for him to see his son and daughter,she has sent him nasty & treatening text messages and has pestered him for money, he pays child support for them but she wants him to give her cash and says if he don't give it to her she will tell the children he is dead. What can he do? The children are 11 & 14 years old:confused: