回复：lz 问的是"进急诊，如果他们自己签字，需要我或我必须做经济担

You didn't get what I said.

Their parent will be 担保 by them when they stay in USA or even 5 years GC period.

If the hospital can't get money from anywhere - I mean from goverment or insurance, they will send bill to his parent. Soon or later, will end up from collection to the 担保 party.

The same as anyone 担保 a student or tenant or business. The debt will fall to the 担保 party.