Since you seemed to be left speechless, then I take it that you don't think I'm jordon anymore. Anyway, the name of the son is made up in the mind (e.g. your son bob will be your son (the name of the son who can possibly be in touch with the caller)). People focus on some part of your message and neglect the others. My mum just figure out who are you, which son have you made contact with and so on. Most people ignore retardism*.
Anyway, most people, when receiving your call, will either think you are a retard or that a random child (son) is in touch with some potentially dangerous party (e.g. online friends on facebook) and scold the random son. But since I don't have a facebook/twitter account, she'll take you as a retard, so who cares? She'll just ignore you**.
*People ignore strangers.
**Don't be daft, people will either scold you or me. So the answer "Who cared? Anyway I'm not." is potentially dangerous for you. She may hire the cops to pwn you or sue you.