The grant-parent said "children of _illegal_ immigrants" and the parent is talking about "children of _Green card holders_". Green card holders are those who have immigrated legally.
The question of the thread is to what extent non-citizens have particular rights. Parents cite two distinct yet substantially similar groups of non-citizens (one presumes that children don't have much agency with respect to the circumstances of their immigration). Both examples argue in the same direction on the question of the thread, so why does this distinction matter?
