Attending rehab itself will not cause your child to lose their job. The Family Medical Leave Act (FMLA) allows a person to take leave from work to seek treatment for substance misuse. This does not mean that a person can take leave to use substances, nor are they protected from losing their job if they violate a work-related policy. If your child follows workplace policy and files for FMLA leave to seek treatment, they will not be fired for attending rehab.