How many Illegals would be in the US if they could not find jobs - place to live & all the other benefits - health, education?

About 75% less.

Remaining would only those who have either a family member who is "legal" and works, or work as free contractors on 1099 basis or purely for cash.

That's the one move that would pretty much end illegal immigration, following Canada's example. And it would be so very easy to accomplish by making e-Verify mandatory, hereby eliminating all those who work with fake or another person's ID, and by punishing anybody severely who gets caught employing an illegal alien, with harsh fines, revocation of the business license, and prison time for a crime.

None. But that's not realistic. They live with a legal resident and use fake passable ID to get a job.

Almost none. Canada doesn't allow illegals to work, get bank accounts, places to live, etc. We don't have an illegal problem.

They don't get health benfits, except maybe in texas. America has a need for cheap labor.