With heightened enforcement of immigration law, anyone who is out of status is vulnerable to a possible apprehension by ICE, depending on the circumstances of the case.
Those who are in unlawful presence, either make a decision to stay, or leave the country to obtain their peace of mind. Each case is different. Some decide to stay, as long as they are aware of the consequences of their decision, and that whatever it is, they make an informed decision about their case. So if they want to plan their departure, they can start disposing their assets and wrapping their affairs. If they decide to stay, I suggest that they have a family preparedness plan, in case the worse case scenario happens to them.