The case, United States v. Texas, could be a life-changer for Rodriguez, 31, an undocumented Mexican immigrant who lives in Coatesville with her husband, also here illegally, and their three U.S.-born children. Depending on the justices' ruling, the couple could put aside their worries of being sent back to Mexico. Or they could go on as they have for 13 years, uncertain of their family's future.