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I would look in to a pre-school, with older children program, Maybe the ymca,But I worked in a prek and had 3 children/German/Spanish/Chinese all in a class of 15 english speaking children with in 4 -6 weeks they were talking and shareing very well. The most important is that you as adult learn english if you really want them to and become part of the local community you live in, As of now English is the nation lang. for now at least!
You may want to consider a daycare with a structured curriculum like Bright Horizons or the Goddard School. They run year-round and you could have both kids in the same place (the 3 year old would not qualify for any pre-K services in the public school system). Depending on when your 5 year old turned 5, she may still be ok in the "pre-K" or "kindergarten prep" classes since the cut-off date for kindergarten is August 31 so there are still 5 year olds out there who haven't started kindergarten yet. For such a short stay, this is probably your easiest and best option. I would call some of the centers and see if they have any provisions for ESL but they would definitely be around kids their age.