Students in the US should be taught in English.
If the students are illegal aliens then they should be deported with their parents. If they were born here, however they are US citizens.
That being said, if their parents are not allowed to stay in the country, then the child should be allowed to leave along with his parents and he can return to the US when he is old enough to support himself. In no case should his parents be allowed to stay on the basis that their child is a US citizen.
Remember, a right to live in the US should not be confused with an entitlement to live in the US. A US citizen also has a right to keep and bear arms, but that doesn't mean the government has to buy him a gun. Similarly, a child may have a right to live in the US but if he does not have the ability to live in the US on his own then the US is under no obligation to allow his non-US parents to stay in order for him to take advantage of his right to live in the US.