Question about their mom

I have a genuine question
If Emily and Erica can barely speak Korean, and their mom can’t really speak good English (she can’t even form simple sentences), how do they communicate? And I don’t mean basic everyday conversations, I mean deep, meaningful conversations.
I don’t mean this in a rude way at all , I’m genuinely curious. I’m not a first generation kid so I’m not familiar with how these kinds of conversations work