@TaxGuyBill   The “pattern or practice” language you like is in Title 8, Section 1324a, and there are regulations that exclude household help from its application.  However, there is also Section 1324, which makes it a felony to encourage someone to continue to reside in the US illegally. That section was (somewhat famously) used in 2012 to prosecute a Homeland Security employee who hired an undocumented worker to clean her Boston condo every couple weeks for $80. District Court Judge Woodlock in that case (you can look it up, the defendant was Lorraine Henderson), granting a new trial because subsequent case law had shown errors in his jury instructions, wrote:

“The government has in § 1324(a)(1)(A)(iv) a tool by which to prosecute anyone who knowingly employs an illegal alien for intermittent domestic work, even if that alien is engaged in employment by terms exempt from sanction under immigration law. Indeed, the government professes the statute is broad enough to permit prosecutions of housewives for employing undocumented aliens . . ."

The government appealed, but then decided to dismiss the case rather than retry it.