Additionally, they will be able to petition for their adult siblings living abroad to immigrate to the U.S., When an adult brother or sister receives a green card, the family (spouse and children) of that adult sibling receives green cards as well.
It is unending.
In a situation like this, someone is going to pay a price, and IT SHOULD NOT BE US CITIZENS AND TAXPAYERS. I am sure you think you are a kind, generous and thoughtful person, but I find it difficult to see any justification for what you are advocating. You have taken sides against your fellow Americans and those who have obeyed our laws.
That would only be under the current incarnation of the DREAM act. Like I said, a Republican rewrite would need to both purge the bad stuff, and take what you said into account.
Right now, if you are a citizen, while it might help to sponsor relatives to come to the US, it is no guarantee they will be permitted. However, at the same time there is a horrific long wait for legitimate citizenship that needs to be streamlined.
But the real emphasis needs to be on keeping good immigrants, and expelling the bad ones. The way we do things now is as nonsensical as not racial-religious profiling at airports. People are not equal, and should not be treated equally, if they do not behave equally.
Speaking from my own vantage point, I have seen some real tangles with immigration, most of which were caused by federal malfeasance.
There are many split families with members who are legal, who are illegal, who are integrated, and who are not integrated, and there is no great rhyme nor reason to it. An elderly woman who has been here for 50 years may be legal, but speak almost no English, and be wholly culturally Mexican, but her granddaughter may be an illegal, yet speak perfect English, graduate from high school, etc.
There has to be a resolution to this that is not unconscionable.