All new residents of New York City, some norther areas of NJ and fringes of Long Island.
When we talk about a society in this context, it would relate to a charity or foundation.
Do you know anything about Long Island at all? About the only charities or foundations related to the area are those Long Islanders pay for, when they feel like it. Oh, and btw. these are the ones perfectly bilingual in Yiddish/English and/or Hebrew/English. You need to travel more.
The thread is about passing on your Polish language and culture to your kids, Varsovian in his first, wrote only about teaching his children English and Polish
And my response is no special effort is required. If living in Poland, just speak to the kids in English at all times. No exceptions. All outside the home will take care of their Polish. The method, under various language and locality scenarios has been tried and proven to be working millions of times, over the last... I dunno... a few thousand years at least.
No need to hire any specialists unless the kids are so called "special needs" ones, or when they are beyond the L2 Critical Period, usually around the time when they reach puberty.
My wife graduated as a Philologist from the Warsaw department of Linguistics in the early 90's, many went on to become leaders within their field in Poland.
That's sweet. Now can I see any links to her publications, or the publications of those "leaders within their field" in which they void research by Chomsky, Skinner, Piaget and such?
Oh, and I think your wife should immediately notify millions of bilingual kids in the US about the results of that research. Otherwise the fools around the world will continue using two languages unaware that they shouldn't, given that not only did they never use the services of a language specialists, but they never heard about any.
From what I see, the Spanish kids without a good grasp of English are entering school at a disadvantage.
How is it different from US born kids?
They don't speak any language on a decent level at all. Among the five words they know, the most frequently used are "like" and "lol".