In the latest twist, the Trump administration’s new policy on green cards adds to the uncertainty families face as they make their way through the immigration landscape.  The most common use of green cards, aka permanent legal residence, comes when an American citizen hopes that their spouse, children or parents will be able to stay in the United States. Often, those people apply while they are in America. The new policy says that except in “extraordinary circumstances,” people will need to apply from their home country.  How this will play out is unclear, because the government might focus on other kinds of applicants. Green card seekers come in many shapes and sizes and not all of them are close family members. Still, immigration lawyers and advocates are concerned that a non-citizen parent might have to leave while the government considers their case.  There’s good reason to worry. Immigration enforcement has already imposed a heavy toll on children and families.…